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| Cheetah - Acinonyx jubatus | |
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| Tweet Topic Started: Jan 7 2012, 08:49 PM (32,988 Views) | |
| Taipan | Jan 10 2012, 04:37 PM Post #16 |
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Male Cheetah Bark Triggers Female Ovulation Matt Kaplan for National Geographic News January 9, 2009 Male cheetahs turn females on—literally. That's because a specific bark triggers the female reproductive system to release eggs, researchers have found. Unlike other cat species, female cheetahs ovulate rarely and at unusual times. They also lack a regular reproductive cycle. All this makes them tough to breed in captivity. But now, scientists know why—and the discovery may boost efforts to breed the rare cats. A team of bioacoustics experts studying cheetah vocalizations stumbled onto the discovery. They noticed that the male's "stutter bark" was made days before breeding took place, said research leader Matt Anderson at the San Diego Wild Animal Park. Because calls unique to a single gender are often associated with reproduction, Anderson and his colleagues took a closer look. Heightened Hormones The team introduced a sexually mature female cheetah to two males during a series of experiments, recording calls made by the cats and monitoring the hormones found in their feces. They discovered that male stutter-bark calls triggered increases in the reproductive hormones estrogen and progesterone in the females' feces. By recording and analyzing stutter-bark rates, the researchers showed that increases in stutter-barking steadily raised the female reproductive hormones responsible for ovulation. "We never expected to see such a tight link between the vocalization and the hormone levels," Anderson said of the research, which has not yet been published in a journal. "This came a real surprise." Conservation Boost The finding has big implications for breeding the rare cat, the researchers said. The cheetah has an estimated adult population of only 7,500, according to the International Union for Conservation of Nature (IUCN). The only known wild cheetah population outside of Africa today is a critically endangered group of fewer than a hundred in Iran. "I think this just goes to show that telephone sex evolved before telephones," said co-researcher Fred Berkovitch, an ecologist at the San Diego Wild Animal Park. "By documenting how sound makes animals horny, we hope to improve conservation-breeding programs." Booty Call of the Wild Using sound to jump-start reproduction is common among birds, but in mammals it is almost unheard of, experts say. Male red deer are known to roar to advance the timing of ovulation in females, for instance. But a male mammal using a signal to activate a reproductive cycle in a female has never been observed before. Dan Blumstein, an ecologist at the University of California, Los Angeles, said the findings were "neat, but not unexpected." The new research illustrates nicely how much can be done to improve breeding of endangered species by watching behaviors and studying hormones in the animals' waste, Blumstein added. ![]() Call it "ovulation on demand"—a bizarre bark from a male cheetah (above, a young male in Africa) jump-starts a female cheetah's reproductive system, scientists said in late 2008. The discovery may explain why cheetahs are so hard to breed in captivity. http://news.nationalgeographic.com/news/2009/01/090109-cheetah-ovulation.html |
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| Taipan | Jan 10 2012, 04:37 PM Post #17 |
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Speedy cheetahs put through paces By Rebecca Morelle Science reporter, BBC News Scientists are attempting to discover exactly what makes cheetahs the fastest running animals on the planet. A Royal Veterinary College (RVC) team is using high-speed cameras and a sensitive track to monitor the big cats as they sprint. Cheetahs can reach speeds of at least 104km/h (64mph) and they can achieve their top speed in just a few paces. The study is being carried out with North African cheetahs from ZSL Whipsnade Zoo. Professor Alan Wilson, head of the structure and motion laboratory at RVC, said: "The cheetah is fascinating because it can run 50% faster than any of the other animals we are familiar with, so in terms of understanding what limits how fast you can run, the cheetah is a wonderful animal to study." Chasing chicken Just as most domestic cats cannot resist chasing a piece of string, cheetahs also find the temptation of some twitching twine too difficult to ignore - especially if a tasty treat is dangling from the end. The lure of some string to play with is to difficult to resist So the research team entice the zoo's cheetahs to run by attaching some choice chicken pieces - wings and feet are a favourite - to a loop of fast-moving string that is pulled along the enclosure by an electric motor. And as the cats chase the chicken feast, four high-speed cameras, which record at 1,000 frames per second - compared with 25 frames per second for standard cameras - capture their every move. Penny Hudson, a PhD student at RVC, said: "We use two cameras on each side of the enclosure so we can see the cheetah from both sides. "When a cheetah gallops, it does different things with either side of its body - it has an asymmetric gate." The scientists are also using special plates that are embedded within cheetahs' running track. Miss Hudson explained: "The plates are like sophisticated weighing scales that are able to measure all the forces going through their legs." Lightning Bolt The scientists are going to compare their results with other studies that have been carried out on greyhounds, which can reach top speeds of approximately 60km/h (40mph). The researchers are comparing how cheetahs and greyhounds run Miss Hudson said: "Greyhounds are artificially bred by us to be fast, whereas these [cats] have evolved for that. "But cheetahs can run much faster than a racing greyhound. "So we're trying to get them running at similar speeds to see what they do that's the same and what they do that makes them go that little bit faster." In speedy humans - the fastest on record being Usain Bolt who ran 100m in 9.69 seconds (an average of 37km/h or 23mph) - speed is thought to be constrained by leg strength. Usain Bolt ran the 100m in 9.69 seconds While in greyhounds, speed is believed to be limited by how quickly the dogs can swing its legs. But for cheetahs - the reasons are still unclear - so the data from the experiments will be used to examine the forces and dynamics of the cats' legs, their speed, the length of each stride, as well as joint angles and posture. Miss Hudson added: "We really don't know what it is about cheetahs that make them run so fast - it might be their flexible spines, or it might be their shoulder blades, it could be that they stretch their legs a bit more, but hopefully the data will unravel some of those mysteries." Wild cats Although cheetahs' speedy reputation is well documented, there is still a question mark hanging over the top speeds that one can reach. In 1997, a paper published in the Journal of Zoology gave the figure at 104km/h (64mph). The data came from an experiment that took place in Kenya in 1965, where a captive cheetah was timed as it chased the remains of a Sunday lunch attached to the back of a 4x4 vehicle. So far the captive cheetahs are reaching top speeds of 54km/h But researchers think it is very likely that the cats can run even faster than this. Professor Wilson, whose biomechanics research is funded by the Biotechnology and Biological Sciences Research Council, said that the captive cheetahs at Whipsnade were so far reaching 54km/h (34mph). He explained: "We know that cheetahs won't reach their full speed here. We hope they'll get to as fast as our racing greyhounds do, and we hope to get to a bigger space to do this." The team also hopes to study cheetahs in the wild - where they would like to look at how wild cats run and also attempt to record a more accurate top speed. Professor Wilson said: "Eventually we'd love to be able to get GPS and video data from cheetahs in the wild that are out and hunting - this is where they will be at the limits of their performance." The team hopes to study the cheetahs in a larger enclosure http://news.bbc.co.uk/2/hi/science/nature/8137962.stm |
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| Taipan | Jan 10 2012, 04:38 PM Post #18 |
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Cheetah sets world speed record By John Johnston • jjohnston@enquirer.com • September 9, 2009 ![]() Sarah, an 8-year-old Cincinnati Zoo cheetah, succeeded Wednesday in setting the world speed record for land mammals. Sarah covered 100 meters in 6.13 seconds at the zoo’s Regional Cheetah Breeding Facility, also known as the Mast Farm, in Clermont County. It was her second run of the day. In her first try, she ran 100 meters in 6.16 seconds. The record had been 6.19 seconds. The zoo announced in July that the record attempt would pit Sarah against Zaza, an 8-year-old female cheetah at Cheetah Outreach in South Africa. Zaza’s Aug. 15 run in South Africa was postponed because bad weather caused a muddy track. She’s expected to run in late September or early October. Sarah’s run initially was planned for Kentucky Speedway, but her handlers moved the run to her training facility because she’s most comfortable there and they felt she’d have a better chance of setting the record. The course was certified by the Road Running Technical Council of USA Track & Field. The world speed record attempts are meant to draw attention to the plight of cheetahs. The International Union for Conservation of Nature lists the species as threatened, the risk level just below endangered. The worldwide cheetah population is estimated at fewer than 10,000. Cheetahs are the world’s fastest land mammals, capable of reaching speeds up to 70 mph over short distances. In its natural habitat, the African savanna, it uses that speed to chase down prey. In comparison, humans are a rather plodding species, at least when it comes to sprints. Jamaica’s Usain Bolt holds the 100-meter record with a time of 9.58 seconds, which he set last month at the world championships. The zoo’s Cheetah Encounter exhibit puts the cats’ running ability on display at 11 a.m. and noon on Saturdays and Sundays through Oct. 4. In 2000, a Cincinnati Zoo cheetah named Moya set the world speed record for land mammals, covering 100 meters in 6.60 seconds. Moya, who came from Cheetah Outreach, died in January. Moya’s brother, Nyana, who lives in South Africa, broke that record in 2001 with a time of 6.19 seconds. http://news.cincinnati.com/article/20090909/NEWS01/309080011 Edited by Taipan, Apr 24 2012, 11:21 PM.
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| Taipan | Jan 10 2012, 04:38 PM Post #19 |
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Epic cheetah hunt filmed in HD By Matt Walker Editor, Earth News Page last updated at 08:11 GMT, Monday, 12 October 2009 09:11 UK One band of brothers has developed a taste for ostrich Stunning footage has been captured of three cheetahs cooperating to hunt and bring down an adult ostrich. The high-definition (HD) film of the hunt was recorded by a BBC crew for the natural history series Life. The behaviour could be unique among cheetahs, which are usually too slight to bring down such a formidable foe. However, the three cheetahs, thought to be a band of brothers, have learnt how to routinely hunt this largest of birds. Life producer Mr Adam Chapman describes how the film crew captured the cheetahs behaving in such a striking behaviour on camera. "It's in a place called the Lewa Wildlife Conservancy in Kenya. The main bit of Lewa is about 60 square miles, it's huge. Basically the wildlife comes and goes off it." Ten years ago, three male cheetahs (Acinonyx jubatus) arrived in the area, which they soon made their territory. Male cheetahs often form collations to defend a good hunting area and gain better access to females. But while cheetahs are incredibly fast, they are so slight that even coalitions usually only attempt to hunt animals that a single male can bring down. Male cheetahs will often team up when hunting However, these three brothers have learnt to hunt cooperatively, Mr Chapman explains. "They are amazing on what they will take on," he says. While researching and filming for Life, Chapman and his colleagues saw the cheetahs hunting the calves of common eland, one of the largest antelope in Africa. "If they got really lucky they'd succeed, and if they got unlucky they'd get beaten up by the adult eland or chased off." The team also saw the cats hunting injured oryx, which sport long sharp horns over 1m long. "One of them was quite lucky not get skewered in the process. The cheetah are pretty cock sure. They chance their arm. And that's probably how they came to start taking ostriches routinely. By one of them giving it a go." The epic ostrich hunt was filmed in high-definition (HD) by BBC wildlife cameraman and presenter Simon King, who captured the event early one evening, after tracking the cheetahs for most of the day. In the film, the three cheetahs can be seen stalking a male ostrich and giving chase, before breaking off midway to hunt an unsuspecting female ostrich instead. One male cheetah jumps on the female ostrich's back, before the two other brothers join in to wrestle the huge bird to the ground. "An ostrich is big enough and strong enough to actually run with the cheetah on its back," says Mr Chapman. "These three are hunting prey that it really takes their combined effort to pull down." "There are a lot of cheetah in Africa, but however long I've been interested in these things, I've never heard of it before and I've certainly never seen it." "What is special about it is they do it routinely, and they do it together." The film crew say there is anecdotal evidence that the cheetahs may hunt in phase with the full moon, as it offers the best light at night. The behaviour of the three cheetahs is so unique that it will likely die out with this particular band of brothers. "When one of them pegs it and they are forced to stop doing it, that's it. There won't be another generation of Lewa cheetah hunting ostriches," says Mr Chapman. The BBC series Life is broadcast at 2100BST on BBC One each week from Monday 12th October. http://news.bbc.co.uk/earth/hi/earth_news/newsid_8302000/8302054.stm |
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| Taipan | Jan 10 2012, 04:39 PM Post #20 |
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Cheetah prey and hunting success rate Kgalagadi Cheetah Project![]() http://www.tllf.org.za/cheetahs/report4.html Cheetah with Gemsbok kill ![]() Camel Killed by Cheetah
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| Taipan | Jan 10 2012, 04:40 PM Post #21 |
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[quote =Pars]ASIATIC CHEETAH In Iran A report on Iranian or Asiatic Cheetah http://wildlife.ir/English/Library/Farhadinia_MiandashtCheetahReport_Iran2007.pdf According to the reports of local people, Cheetahs kill young camel in Iran too. "Claims of cheetahs killing young camel, sheep, and goat are rife among the shepherds inside the species habitat throughout the country; however, there was no evidence to approve it (B. Najafi, Jourabchian, and A. Karimi, pers.comm,). Two cheetah scats (FIG.18) as well as a few reports of livestock attack which was verified by us are considered to be the first reliable evidences of cheetah depredation on livestock in the country." On page 33 you will see a picture of red fox preyed by Asiatic Cheetah. Baby and Juvenile Boars, Sand Cats are said to be potential prey items in this report. From wikipedia: In Iran, the diet of the Asiatic Cheetah consists mainly of Jebeer Gazelle (also called Chinkara), Goitered Gazelle, wild sheep, Wild Goat, and Cape Hare. The Asiatic Cheetah’s range is restricted to the Central Iranian plateau. The main threat to the species is loss of their primary prey species, Jebeer gazelle, goitered gazelle, urial sheep, and wild goat, due to poaching and grazing competition with domestic livestock. Habitat loss from mining development and poaching of Asiatic Cheetahs also threaten their populations in Iran. "Wildlife Conservation Society (WCS)" and the "Department of Environment, Iran (DoE)" have started a collaring project for Asiatic Cheetahs in the fall of 2006. In Iran Urial (Ovis orientalis) and wild goat (Capra aegagrus) appear to form the cheetah’s primary prey today but both species inhabit mainly foothills or mountain slopes, habitats that are difficult for cheetahs to hunt. In Central Asia An article on Asiatic Cheetah in Central Asia: http://www.catsg.org/cheetah/05_library/5_3_publications/M/Mallon_2007_History_of_cheetahs_in_Central_Asia.pdf "Few details of the ecology and biology of Central Asian cheetahs are known. The main prey species was goitered gazelle Gazella subgutturosa which was formerly widespread and numerous across the region. Other prey species recorded include wild sheep or urial Ovis orientalis, young kulan Equus hemionus, saiga Saiga tatarica, hares Lepus tolai, porcupine Hystrix indica, small rodents, and birds such as sandgrouse Pterocles spp. (Bannikov 1984, Gvozdev 1989, Heptner & Sludskii 1972, Sadykov 1988). Cheetahs rarely preyed on domestic animals and were not considered a threat to livestock." In India From Wikipedia: In India fifty years ago, prey was abundant, and it fed on the Blackbuck, the Chinkara, and sometimes the Chital and the Nilgai. ...is in low, isolated, rocky hills, near the plains on which live antelopes, its principal prey. It also kills gazelles, nilgai, and, doubtless, occasionally deer and other animals. Instances also occur of sheep and goats being carried off by it, but it rarely molests domestic animals, and has not been known to attack men. Its mode of capturing its prey is to stalk up to within a moderate distance of between one to two hundred yards, taking advantage of inequalities of the ground, bushes, or other cover, and then to make a rush. Its speed for a short distance is remarkable far exceeding that of any other beast of prey, even of a greyhound or kangaroo-hound, for no dog can at first overtake an Indian antelope or a gazelle, either of which is quickly run down by C. jubatus, if the start does not exceed about two hundred yards. General McMaster saw a very fine hunting-leopard catch a black buck that had about that start within four hundred yards. It is probable that for a short distance the hunting-leopard is the swiftest of all mammals. —Blanford writing on the Asiatic Cheetah in India quoted by Lydekker an artcile on hunting with the help of cheetah: http://www.catsg.org/cheetah/05_library/5_3_publications/D/Dharmakumarsinhji_1992_Cheetah_hunting.pdf About India's intention to reintroduce Cheetah. But which is astonishing is they are planning to reintroduce Namibian Cheetah instead of Asiatic cheetahs from Iran: http://news.mongabay.com/2009/0709-cheetah_india.html and latest developments about this project: http://ibnlive.in.com/news/state-govts-reluctant-to-bring-the-cheetah-to-india/101109-3.html [/quote] |
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| Taipan | Jan 10 2012, 04:42 PM Post #22 |
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Elusive Saharan Cheetah Captured in Photos By Jeanna Bryner, LiveScience Managing Editor posted: 24 December 2010 08:17 am ET A hind image showing the Saharan cheetah in the Termit region of Niger, Africa, was captured recently by a camera trap. Credit: Sahara Conservation Fund/WildCRU. Full Size 3 of 3 ![]() A camera trap recently captured the elusive Saharan cheetah in a vast desert in Niger, Africa. An elusive Saharan cheetah recently came into the spotlight in Niger, Africa, where a hidden camera snapped photos of the ghostly cat, whose pale coat and emaciated appearance distinguish it from other cheetahs. In one of the images the sleek, light-colored cat with small spots on its coat and a small head is turning in the direction of the camera, its eyes aglow. Its appearance, and how the Saharan cheetah (Acinonyx jubatus hecki) is genetically related to other cheetahs is open to question, said John Newby, CEO of the Sahara Conservation Fund (SCF), who is part of the team, along with SCF's Thomas Rabeil and others, who captured the camera-trap snapshots between July ad August. What they know about this species comes from the few photos they've managed to capture. "I think we were more happy than surprised when the images turned up, because we knew cheetahs were in the general area because we had seen their tracks on several occasions," Newby said. "However, the area is so vast that picking up an animal as rare as this always entails a lot of luck and good judgment on where to place the cameras." The animal is so rare and elusive scientists aren't sure how many even exist, though they estimate from the few observations they've made of the animal and tracks that fewer than 10 individuals call the vast desert of Termit and Tin Toumma in Niger home. Fewer than 200 cheetahs probably exist in the entire Sahara. Losing this cheetah would also mean losing important genetic and biological diversity, as these animals have adaptations for survival in extreme desert conditions. Their home can reach sizzling temperatures up to 113 degrees Fahrenheit (45 degrees Celsius), and is so parched no standing water exists. "They probably satisfy their water requirements through the moisture in their prey, and on having extremely effective physiological and behavioral adaptations," Newby said. In an effort to conserve water and stay out of the heat, the Saharan cheetah is even more nocturnal than other cheetahs. Spotting these cats in the wild has been a challenge. "They are incredibly shy and elusive animals," Newby said. In addition, they likely have broad home ranges since their prey – gazelles, hares, large birds and smaller rodents – are relatively scarce. Observations that have been made suggest they prefer caves and rock shelters as breeding dens. Among the threats to the pale cat are scarcity of prey due to poaching and overuse, and conflicts with herders over stock harassment and killing of their animals, according to SCF. Apparently cheetah skins are prized as prayer rugs or used to make slippers. "They are suspected of taking goats and even baby camels, and as a result are persecuted just like most other large predators," Newby said. "Work underway with local nomads is putting together the true picture of livestock predation in an attempt to reduce the arbitrary slaughter of carnivores that has massively reduced populations of cheetah and striped hyenas." Newby and Rabeil say the camera-trap study will provide tangible evidence for the cheetah's existence in the Termit area. "The more we know about the animal the better we can conserve it, including pinpointing key areas for extra protection," Newby said. "The cheetah’s presence adds weight to arguments for the entire zone’s protection as a nature reserve and strengthens our ability to raise support for conservation activities." The Saharan cheetah is listed as critically endangered on the 2009 IUCN Red List of Threatened Species. (IUCN stands for International Union for Conservation of Nature.) http://www.livescience.com/animals/saharan-cheetah-photo-niger-africa-101224.html |
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| Taipan | Jan 10 2012, 04:43 PM Post #23 |
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Iran's endangered cheetahs are a unique subspecies By Ella Davies Earth News reporter Page last updated at 09:19 GMT, Monday, 24 January 2011 Acinonyx jubatus venaticus Iran's critically endangered cheetahs are the last remaining survivors of a unique, ancient Asian subspecies, genetics experts reveal. New analysis confirms Iran's cheetahs belong to the subspecies Acinonyx jubatus venaticus. DNA comparisons show that these Asiatic cheetahs split from other cheetahs, which live in Africa, 30,000 years ago. Researchers suggest that Iran's cheetahs must be conserved to protect the future of all cheetahs. Cheetahs formerly existed in 44 countries in Africa but are now only found in 29. Historically, they were also recorded across southwest and central Asia but can now only be found in Iran. Scientists have previously said that cheetahs have low genetic variability, theorising that a "population crash" approximately 10,000 years ago led to inbreeding in the species. Despite this, five 'different' subspecies are currently described according to where they live. Genetic studies in the 1990s confirmed cheetahs found in southern Africa (A. j. jubatus) and east Africa (A. j. raineyi) as separate subspecies. However, it has not been clear whether populations in west Africa (A. j. hecki), northern-east Africa (A. j. soemmeringii), and north Africa and Iran (A. j. venaticus) are genetically different enough to deserve their current status as subspecies. Aiming to solve the puzzle of modern cheetahs' origins, scientists from the University of Veterinary Medicine in Vienna, Austria have been working in collaboration with the Iranian Department of Environment and wildcat conservation group Panthera. Dr Pamela Burger and her team analysed the DNA of cheetahs from a wide geographical and historical range, including medieval remains found in north-western Iran. "With our data we prove that current Iranian cheetahs represent the historical Asiatic subspecies A.j. venaticus as they share a similar genetic profile with specimen originating from northwestern Iran in 800-900 CE," explains Dr Burger. The researchers have also been able to distinguish Iranian cheetahs from their nearest neighbours in northern-east Africa which were confirmed as A. j. soemmeringii. Cheetahs in north Africa, previously considered the same subspecies as those in Iran, were actually found to have more in common genetically with those in west Africa. By comparing sequences in the DNA, researchers have found that the unique Asiatic cheetahs separated from the rest of the species in southern Africa over 30,000 years ago. Dr Burger explains that because this split occurred long before the theorised population crash, A.j. venaticus represents a highly distinct lineage. "The implications of our discovery are that the confirmation of the subspecies is a basis for future conservation management. If the aim is to conserve this biodiversity, subspecies should not be mixed," she says. Currently estimated at just 60-100 individuals with less than half at mature breeding age, the Iranian cheetah population is classified as critically endangered by the IUCN Red List. Together with the United Nations Development Programme, Panthera and the Wildlife Conservation Society the Iranian Department of the Environment has established a programme to make conservation of the Asiatic cheetah a national priority. Conservationists are concerned that time is running out for Iran's cheetahs. "We have been successful in stabilising numbers in Iran but we still have a long way to go before we can consider this unique sub-species secure," says Alireza Jourabchian, Director of the Conservation of the Asiatic Cheetah Programme (CACP) in Iran. Threats facing the small population include overhunting of cheetah prey, habitat degradation and direct poaching. http://news.bbc.co.uk/earth/hi/earth_news/newsid_9365000/9365567.stm |
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| Taipan | Jan 10 2012, 04:44 PM Post #24 |
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| Taipan | Jan 10 2012, 04:45 PM Post #25 |
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| Red Dog | Jan 11 2012, 04:47 AM Post #26 |
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Sexual dimorphism is quite strong among cheetahs and is an adaptation to both killing larger prey and male intraspecific competition for breeding rights. The following study shows male cheetahs exhibit significant sexual dimorphism vs. females: Source: MORPHOLOGY, PHYSICAL CONDITION, AND GROWTH OF THE CHEETAH (ACINONYX JUBATUS JUBATUS) Journal of Mammalogy, Marker and Dickman, 84(3):840–850, 2003 Information regarding morphology of wild cheetahs is scant, and even where data exist they rarely were collected using a standardized methodology. We used a consistent technique to examine 241 wild Namibian cheetahs (Acinonyx jubatus jubatus) to study morphology, sexual dimorphism, growth rates, and physical condition and to investigate how these data compared with those in previous studies. Significant sexual dimorphism was evident for all measurements. The majority of cheetahs were in excellent condition at the time of examination, although old cheetahs and those that had been held captive for more than a month were in significantly poorer condition. Male cheetah coalitions kill significantly larger prey than females. In fact, the prey is on average larger than leopard prey (male and female average). For example, in the study below male cheetah prey averaged more than 65 kg with a third weighing more than 100 kg. By contrast, the average weight of leopard prey is typically less than 50 kg. Source: Charlene Bissett, Masters of Science Thesis: THE FEEDING ECOLOGY, HABITAT SELECTION AND HUNTING BEHAVIOUR OF RE-INTRODUCED CHEETAH ON KWANDWE PRIVATE GAME RESERVE, EASTERN CAPE PROVINCE However the different cheetah groups on Kwandwe killed different sized prey. There is some controversy over the extent to which coalitions of cheetah hunt cooperatively (Eaton 1970; Kruuk & Turner 1967; Caro 1994). However, on Kwandwe, the three male coalition accompanied one another on all hunts and actively co-operated in the hunts. On a number of occasions the cheetah drove prey toward concealed coalition partners (pers. obs). The co-operation in hunting by the three adult male coalition on Kwandwe enabled them to kill large prey (>65kg), and this has been reported in some previous studies (Caro 1994; Hunter 1998; Mills 1998; Mills et al. 2004). Male coalitions need a greater biomass of food per unit time than solitary cheetah (Caro 1994) and this need could be met by making more frequent kills or by killing larger prey. It has been suggested that large carnivores will resist changing kill frequency and that changes in group size are associated with change in the size of the prey (Caro 1994) and this appears to be the pattern at Kwandwe. More than a third of kills made by the coalition weighed more than a 100kg and in most cases the cheetah remained at their kills until they were satiated. However, the continuous observations on the coalition showed that the cheetah did adjust the kill rate to meet their energetic needs as they killed twice on the same day on more than one occasion. Significantly, on these occasions the kills were juveniles which would explain the need to increase the kill rate. Females with cubs preyed on more medium sized animals than single females and again this can be explained in terms of the increased needs of the group over a solitary female. However, unlike the coalition the adult females and their cubs do not have the power to kill large prey. |
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| Taipan | Apr 26 2012, 07:41 PM Post #27 |
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Spotless cheetah snapped in the wild Photographer reveals pictures of rare big cat with a sandy golden coat and brown freckles instead of dark spots Steven Morris and agency guardian.co.uk, Wednesday 25 April 2012 17.59 BST Article history ![]() A spotless adult cheetah at the Athi Kapiti Conservancy in Kenya – the sighting is thought to be first in almost a century. A rare 'spotless' cheetah has been photographed in Kenya by wildlife photographer Guy Combes, who got within around 50m of the big cat. Combes, originally from Dorset but now based in California, had heard tale of the spotless leopard and travelled to the Athi Kapiti Conservancy in search of it but gave up after days of fruitless searching. "I didn't think it likely that we would find the cheetah and went back to Nairobi. I then got a call saying it had been seen again so I spent another two days searching," he said. Eventually he spotted the animal. "I was really excited as we managed to get about 50 yards away. It was was a staggeringly beautiful animal. I didn't expect to see it at all, the area we were going to search was 100,000 acres without borders and it could have easily been beyond that." John Pullen, curator of mammals at Marwell Wildlife in Hampshire, who has examined the photographs, described the sighting as "quite rare". He said: "There are some spots still evident over the back area but most are missing. The spots or markings on all wild cats are in fact the skin colour and the hair growing from that part of the skin takes on the colouration, so if you shaved off the hair the pattern would be the same. This is really like a rare skin issue where something has happened to the genetic coding that would give the normal pattern." Combes captured the images last year but has shown it now after photographs of a strawberry-coloured leopard photographed in South Africa emerged. It also comes as footage and images of a white killer whale spotted off the eastern coast of Russia surfaced. http://www.guardian.co.uk/environment/2012/apr/25/spotless-cheetah-pictures-wild?newsfeed=true Edited by Taipan, Feb 3 2018, 01:58 PM.
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| Taipan | Jun 22 2012, 08:37 PM Post #28 |
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The Secret to Cheetahs' Speedy Stride Found Jennifer Welsh, LiveScience Staff Writer Date: 21 June 2012 Time: 08:02 AM ET Cheetah mid-leap with a lure in its mouth. Cheetahs and greyhounds have very similar running styles, but somehow the big cats leave their doggy rivals in the dust. Their secret: Cheetahs "switch gears" while running, striding more frequently at higher speeds, new research finds. Greyhounds, on the other hand, seem to take the same number of strides per second at every speed. Cheetahs have been recorded running at up to 65 mph (105 kilometers per hour) — much faster than a greyhound, which, as the fastest canid (doglike animal), is known to reach 43 mph (68 kph). "Cheetahs and greyhounds are known to use a rotary gallop, and physically they are remarkably similar, yet there is this bewitching difference in maximum speed of almost a factor of 2," study researcher Alan Wilson, from the Royal Veterinary College in the United Kingdom, said in a statement. Running wild The researchers studied cheetahs from the ZSL Whipsnade Zoo in the suburbs of London and the Ann van Dyk Cheetah Centre in South Africa. They also studied retired racing greyhounds from the United Kingdom. They planted force-measuring plates in the ground and had the animals chase after a piece of chicken. They took high-speed video of the animals in motion and measured the force created by the running animal, calibrated with how much it weighed. The cheetahs being studied didn't come close to the speeds reported for wild cheetahs — the zoo animals reached 38 mph (61 kph), while the greyhounds topped out at 43 mph (68 kph). The researchers said this was probably because the captive-born cheetahs have never really gotten the chance to let loose in the wild and run full throttle. "They have lived in a zoo for several generations and have never had to run to catch food. They have probably never learned to run, particularly," Wilson said. "The next stage is to try to make measurements in wild cheetahs in the hope of seeing higher speeds." Strut & stride The researchers did find a few differences, however; for instance, the cheetah's stride was slightly longer than the greyhound's. The captive cheetahs also were able to change their stride frequency (strides per second) as they reached higher speeds: At 20 mph (32 kph), they took 2.4 strides per second, but at 38 mph (61 kph), they took 3.2 strides per second. The greyhounds, on the other hand, maintained a constant rate of around 3.5 strides per second no matter how fast they ran. Wilson suspects wild cats may be able to reach frequencies of four strides per second, which, in combination with longer stride lengths, may be what allows them to outstrip their poochy counterparts. The study was published today (June 21) in the Journal of Experimental Biology. http://www.livescience.com/21083-cheetah-greyhound-speed-secret.html Edited by Taipan, Feb 3 2018, 02:00 PM.
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| Taipan | Jul 4 2012, 02:33 PM Post #29 |
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Administrator
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Animal picture of the day: rare image of Asiatic cheetah and cubs Jeremy Hance mongabay.com July 03, 2012 ![]() A rare image of a mother Iranian cheetah and its three cubs. Photo by: Javad Shokouhi/Yazd DOE-CACP. The Asiatic cheetah (Acinonyx jubatus venaticus), also known as the Iranian cheetah, is one the world's rarest cat subspecies with somewhere between 70-110 individuals left. No surprisingly it is considered Critically Endangered by the IUCN Red List. "This is a special snapshot of an Asiatic cheetah mother flanked by three cubs in a cave sheltered from the intense Iranian desert sun. This same cheetah mother was featured in a recent Wildlife Extra article that reported on camera trap images showing her migrating between two reserves 130 kilometers or 80 miles apart!" Panthera told mongabay.com of the above image. Panthera, which is devoted to cat conservation, has a program specifically devoted to this subspecies. Once found across the Middle East and Central Asia the subspecies is now restricted almost entirely to Iran; abundant populations that survived alongside tigers and elephants in India have vanished, and are likely gone from Afghanistan and Pakistan as well. The world's last population of Asiatic cheetahs remains hugely imperiled by prey decline due to decades of overhunting and ongoing poaching; habitat degradation due to overgrazing and drought; human-wildlife conflict with herders and livestock; and even cubs captured for the illegal pet trade. Read more: http://news.mongabay.com/2012/0703-asiatic-cheetah-pod.html#ixzz1zcvY6XTo Edited by Taipan, Feb 3 2018, 02:00 PM.
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| 221Extra | Sep 4 2012, 11:40 PM Post #30 |
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Deny, deny, deny.
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Cheetah weights:![]() From "Wild Cats of the World" Edited by 221Extra, Sep 4 2012, 11:41 PM.
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