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Grizzly bear killings on big prey!; The incredible hunting feats of the great bear
Topic Started: Apr 11 2018, 05:26 PM (509 Views)
Ursus 21
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Bear predation on moose

Killing of an adult female:

Posted Image

Video: Grizzly bear kills moose in a driveway

Killing of a calf:

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Video: Grizzly bear kills moose calf

Characteristics of Wolf and Bear Attacks on Moose and Caribou in Mount McKinley National Park, Alaska

Two adults killed:

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Source: Study of bear predation on large mammals

Bear predation on bison

Killing of a calf protected by its mother:

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Video: bear snatches bison calf

Thanks goes out to Taipan:

Quote:
 
Maybe "female grizzly failed to kill an "ONLY" injured young bull
bison but this:
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medius sized female (probably close to 300 lbs)
killed and dragged a c.500kg adult female bison.
http://www.lasy.gov.pl/zakladki/aktualnosci/zubr-ofiara-niedzwiedzia

Thanks goes out to Warsaw2014:

Quote:
 
Kodiak(probably female) brown bear kill bison.
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http://carnivoraforum.com/topic/30028339/1/#new

Bear predation on reindeer

Killing of an adult male (probably suffering from illness or injury):

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Video: Reindeer killed by a female bear

Characteristics of Wolf and Bear Attacks on Moose and Caribou in Mount McKinley National Park, Alaska

One injured adult male killed:


Posted Image

Source: Study of bear predation on large mammals

Grizzly Bear Predation on Caribou/Reindeer in Alaska

One adult female killed:

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Source: Study of bears killing and scavenging reindeer

Bear predation on muskoxen

Predation and Multiple Kills of Muskoxen by Grizzly Bears

Many muskoxen were killed, and some bears killed multiple muskoxen at once:

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One bear killed five muskoxen:

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A graph describing adult muskoxen killed in multiple killings by grizzly bears:


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Source: Study of grizzly bear predation on muskoxen

According to this study, five calves and seven adult muskoxen are killed by grizzly bears annually:

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Source: Bear predation is a significant cause of mortality to muskoxen
Edited by Ursus 21, Apr 12 2018, 10:25 AM.
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K9 Bite
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I remember there was this one documentary where a young grizzly charged and chased a herd of reindeer and rammed into one, causing the deer to trip down and get mauled by the bear. The documentary said young bears were more swifter and agile then the adults which is why they can actually chase the prey themselves rather then scavenging or stealing kills like the adults do. Anyone know that documentry?
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Warsaw2014
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https://translate.google.pl/translate?hl=pl&sl=pl&tl=en&u=gospodarkapodkarpacka.pl%2Fnews%2Fview%2F23091%2Fniedzwiedz-zabil-dwa-zubry-w-bieszczadach
. . . . .

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http://gospodarkapodkarpacka.pl/news/view/23091/niedzwiedz-zabil-dwa-zubry-w-bieszczadach
http://www.pressreader.com/canada/edmonton-journal/20110703/282986806573239
A lifetime of bearsAfter three decades of studying these mighty animals, Alberta biologist Gord Stenhouse remains in awe at how clever, powerful -and vulnerable -they are, and at how much we still need to learn in order to save them from us.

"...Most humbling perhaps was the sight of a small 110-kg bear that had killed a huge quarter-horse before burying it in the ground."It looked like a front-end loader had gone in there and buried that horse," he said. "It was a sobering reminder that these are awfully powerful animals..."
"An adult female (12.5 years old) made a kill every 8.25 days.
Her estimated body mass was was 91 kg. 180.3 cm long over the curves, 59.1 cm around the neck, and 106 cm around the chest.
At about 91 kg she was far from big, yet killed nearly an adult moose per week.


These are the bears of GMU 13.
Source: "Game Management Unit 13 Brown Bear Studies" by Ted H. Spraker, Warren B. Ballard, and Sterling D. Miller."
Post # 16
http://carnivoraforum.com/topic/9507720/2

Brown bear vswild boar . .
http://oi65.tinypic.com/2e5nrpz.jpg
Posted Image
Edited by Warsaw2014, Apr 12 2018, 05:11 AM.
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CanineCanis
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Sorry for the garbage quality on this one
Grizzly Bear hunts wild boar
https://youtu.be/cBDxK-PQnkY

Taipan posted this
http://carnivoraforum.com/single/?p=8225882&t=9326945

An account of a bear killing a bison
http://www.bearbiology.com/fileadmin/tpl/Downloads/URSUS/Vol_13/Wyman_13.pdf

I saw an article on grizzly predation on Musk Ox, but you needed to buy access for it and I’m broke
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Ursus 21
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Quote:
 
The bear didn't end up killing the bison actually. Human interference stopped the bear from killing it. At the end, the author just assumes that the bear would have killed the bison if it were given more time.

Quote:
 
This is the exact same account... Lol.

Thank-you for your contribution nonetheless.

Good work Warsaw2014.

K9 Bite, I'm not sure what documentary you're referencing...

Hopefully someone else can help you out.



Bear predation on moose

Predation on moose by radio-collared grizzly bears in east central Alaska

Males killed 3.3-3.9 adults annually, and females killed 0.6-0.8 adults annually:

Radio-collared grizzly bears (Ursus arctos) were sighted daily for approximately 1-month periods during spring, summer, and fall to estimate predation rates. Predation rates on adult moose (Alces alces) were highest in spring, lowest in summer, and intermediate in fall. The highest kill rates were by male grizzlies killing cow moose during the calving period. We estimated that each adult male grizzly killed 3.3–3.9 adult moose annually, each female without cub(s) killed 0.6–0.8 adult moose and 0.9–1.0 adult caribou (Rangifer tarandus) annually, and each adult bear killed at least 5.4 moose calves annually. Grizzly predation rates on calves and grizzly density were independent of moose density and are probably more related to area-specific factors, e.g., availability of alternative foods. An important implication of our results is that managers should not allow moose densities to decline to low levels, because grizzlies can have a greater relative impact on low- than on high-density moose populations and because grizzly predation can be difficult to reduce. Grizzly bears were primarily predators, rather than scavengers, in this area of low prey availability (11 moose/grizzly bear); bears killed four times more animal biomass than they scavenged.

Source: Bear predation on moose

Bears are bigger killers than thought

Adults moose make up about one eighth of the bear's diet:


By carefully analyzing the most gruesome footage, the researchers were also able to identify the bears’ prey. More than half of their meals came from moose or caribou calves, whereas vegetation made up nearly 20%, and adult moose made up just over 12% of the bear's diet, they report this month in the Wildlife Society Bulletin. But there were also some unusual items on the menu: snowshoe hares, swans, and even other brown bears. In one case, a 10-year-old male killed—and ate—a 6-year-old female bear.

Overall, the bears killed an average of 34.4 moose and caribou calves over 45 days. That’s far higher than average kill rates from previous studies using other methods, including aerial observation. Compared with one 1988 study in which scientists counted an average of 5.4 moose calf kills from the air in a different part of Alaska, the new study found an average of 13.3 moose calf kills. The new study also found wide variation in the number of calves killed by any one bear, with one killing 44 calves in 25 days and another killing just seven in 27 days.


Source: Bear predation on adult moose

Large male moose with antlers in season killed by a brown bear:

Posted Image

Edited by Ursus 21, Apr 12 2018, 10:23 AM.
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CanineCanis
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@Ursus 21, well thanks for telling me that because I didn’t know and as for the same account I..... I can explain
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Taipan
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Ursus 21
Apr 12 2018, 09:55 AM

Bear predation on moose

Predation on moose by radio-collared grizzly bears in east central Alaska

Males killed 3.3-3.9 adults annually, and females killed 0.6-0.8 adults annually:

Radio-collared grizzly bears (Ursus arctos) were sighted daily for approximately 1-month periods during spring, summer, and fall to estimate predation rates. Predation rates on adult moose (Alces alces) were highest in spring, lowest in summer, and intermediate in fall. The highest kill rates were by male grizzlies killing cow moose during the calving period. We estimated that each adult male grizzly killed 3.3–3.9 adult moose annually, each female without cub(s) killed 0.6–0.8 adult moose and 0.9–1.0 adult caribou (Rangifer tarandus) annually, and each adult bear killed at least 5.4 moose calves annually. Grizzly predation rates on calves and grizzly density were independent of moose density and are probably more related to area-specific factors, e.g., availability of alternative foods. An important implication of our results is that managers should not allow moose densities to decline to low levels, because grizzlies can have a greater relative impact on low- than on high-density moose populations and because grizzly predation can be difficult to reduce. Grizzly bears were primarily predators, rather than scavengers, in this area of low prey availability (11 moose/grizzly bear); bears killed four times more animal biomass than they scavenged.

Source: Bear predation on moose

Bears are bigger killers than thought

Adults moose make up about one eighth of the bear's diet:


By carefully analyzing the most gruesome footage, the researchers were also able to identify the bears’ prey. More than half of their meals came from moose or caribou calves, whereas vegetation made up nearly 20%, and adult moose made up just over 12% of the bear's diet, they report this month in the Wildlife Society Bulletin. But there were also some unusual items on the menu: snowshoe hares, swans, and even other brown bears. In one case, a 10-year-old male killed—and ate—a 6-year-old female bear.

Overall, the bears killed an average of 34.4 moose and caribou calves over 45 days. That’s far higher than average kill rates from previous studies using other methods, including aerial observation. Compared with one 1988 study in which scientists counted an average of 5.4 moose calf kills from the air in a different part of Alaska, the new study found an average of 13.3 moose calf kills. The new study also found wide variation in the number of calves killed by any one bear, with one killing 44 calves in 25 days and another killing just seven in 27 days.


Source: Bear predation on adult moose

Large male moose with antlers in season killed by a brown bear:

Posted Image



Its always interesting how the one species (Ursus arctos in this case), can differ greatly in their behaviours depending on location. US Brown Bears prey significantly on Moose, compared to European Brown Bears.

Journal Reference:
Bjørn Dahle, Kjell Wallin, Go¨ran Cederlund, Inga-Lill Persson, Line S. Selvaag & Jon E. Swenson Predation on adult moose Alces alces by European brown bears Ursus arctos Wildl. Biol. 19: 165-169 (2013) Original article DOI: 10.2981/10-113

Abstract
Several North American studies have reported significant predation rates on moose Alces alces by brown bears Ursus arctos. We documented predation on moose by brown bears in south-central Sweden, where brown bears and moose occurred at estimated densities of 10-30 and 400-1,340/1,000 km2 , respectively. Bears killed 0.8% of radio-collared adult female moose (i.e. 1 year old) annually and no male moose ( 1 year old). Bear predation was the least important mortality factor we documented. Based on tracking brown bears on snow during spring we recorded one successful hunt for every 372 km of tracks and documented attacks only by adult bears and successful attacks only by adult males. Autopsy of moose older than calves that were killed by brown bears revealed that yearlings were more prone to predation than older moose, and that older (i.e. 2 years) cows were more vulnerable to predation than older bulls. Our study suggests a lower tendency for Scandinavian brown bears to prey on moose compared to most of the North American studies.

Attached to this post:
Attachments: Predation_on_adult_moose_Alces_alces_by_European_brown_bears_Ursus_arctos.pdf (235.83 KB)
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Sam1
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I think size has much to do with that. European brown bear is quite smaller than typical Grizzly, and a lot smaller than Alaskan ones.
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Ursus 21
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Killing of an adult deer:

Posted Image

Video: Grizzly bear kills deer
Edited by Ursus 21, Apr 13 2018, 02:59 PM.
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Warsaw2014
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Ursus 21
Apr 13 2018, 02:54 PM
Killing of an adult deer:

Posted Image

Video: Grizzly bear kills deer
Fawn deer. . . . .
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Ursus 21
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Warsaw2014
Apr 15 2018, 06:28 PM
Ursus 21
Apr 13 2018, 02:54 PM
Killing of an adult deer:

Posted Image

Video: Grizzly bear kills deer
Fawn deer. . . . .
Please do not spam my thread with one word comments.
Edited by Ursus 21, Today, 2:43 PM.
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Ursus arctos
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Taipan
Apr 12 2018, 08:36 PM
Its always interesting how the one species (Ursus arctos in this case), can differ greatly in their behaviours depending on location. US Brown Bears prey significantly on Moose, compared to European Brown Bears.

Journal Reference:
Bjørn Dahle, Kjell Wallin, Go¨ran Cederlund, Inga-Lill Persson, Line S. Selvaag & Jon E. Swenson Predation on adult moose Alces alces by European brown bears Ursus arctos Wildl. Biol. 19: 165-169 (2013) Original article DOI: 10.2981/10-113

Abstract
Several North American studies have reported significant predation rates on moose Alces alces by brown bears Ursus arctos. We documented predation on moose by brown bears in south-central Sweden, where brown bears and moose occurred at estimated densities of 10-30 and 400-1,340/1,000 km2 , respectively. Bears killed 0.8% of radio-collared adult female moose (i.e. 1 year old) annually and no male moose ( 1 year old). Bear predation was the least important mortality factor we documented. Based on tracking brown bears on snow during spring we recorded one successful hunt for every 372 km of tracks and documented attacks only by adult bears and successful attacks only by adult males. Autopsy of moose older than calves that were killed by brown bears revealed that yearlings were more prone to predation than older moose, and that older (i.e. 2 years) cows were more vulnerable to predation than older bulls. Our study suggests a lower tendency for Scandinavian brown bears to prey on moose compared to most of the North American studies.

The relatively predator naive moose of northeastern Norway make a significant part of the brown bear's diet:
https://www.researchgate.net/publication/252463787_The_diet_of_the_brown_bear_Ursus_arctos_in_the_Pasvik_Valley_northeastern_Norway
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