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| Tyrannosaurus rex v Ankylosaurus magniventris | |
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| Tweet Topic Started: Jan 28 2012, 10:08 PM (48,664 Views) | |
| Taipan | Jan 28 2012, 10:08 PM Post #1 |
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Tyrannosaurus rex Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small, though unusually powerful for their size, and bore two clawed digits. Although other theropods rivaled or exceeded Tyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators. By far the largest carnivore in its environment, Tyrannosaurus rex may have been an apex predator, preying upon hadrosaurs and ceratopsians, although some experts have suggested it was primarily a scavenger. The debate over Tyrannosaurus as apex predator or scavenger is among the longest running in paleontology. Tyrannosaurus rex was one of the largest land carnivores of all time; the largest complete specimen, FMNH PR2081 ("Sue"), measured 12.8 metres (42 ft) long, and was 4.0 metres (13.1 ft) tall at the hips. Mass estimates have varied widely over the years, from more than 7.2 metric tons (7.9 short tons), to less than 4.5 metric tons (5.0 short tons), with most modern estimates ranging between 5.4 and 6.8 metric tons (6.0 and 7.5 short tons). Packard et al. (2009) tested dinosaur mass estimation procedures on elephants and concluded that dinosaur estimations are flawed and produce over-estimations; thus, the weight of Tyrannosaurus could be much less than usually estimated. Other estimations have concluded that the largest known Tyrannosaurus specimens had a weight exceeding 9 tonnes. ![]() Ankylosaurus magniventris Ankylosaurus is a genus of ankylosaurid dinosaur, containing one species, A. magniventris. Fossils of Ankylosaurus are found in geologic formations dating to the very end of the Cretaceous Period (about 66.5–65.5 Ma ago) in western North America. Although a complete skeleton has not been discovered and several other dinosaurs are represented by more extensive fossil material, Ankylosaurus is often considered the archetypal armored dinosaur. Other ankylosaurids shared its well-known features—the heavily-armored body and massive bony tail club—but Ankylosaurus was the largest known member of the family. In comparison with modern land animals the adult Ankylosaurus was very large. Some scientists have estimated a length of 9 meters (30 ft). Another reconstruction suggests a significantly smaller size, at 6.25 m (20.5 ft) long, up to 1.5 m (5 ft) wide and about 1.7 m (5.5 ft) high at the hip. Ankylosaurus may have weighed over 6,000 kilograms (13,000 lb), making it one of the heaviest armored dinosaurs yet discovered. The body shape was low-slung and quite wide. It was quadrupedal, with the hind limbs longer than the forelimbs. Although its feet are still unknown, comparisons with other ankylosaurids suggest Ankylosaurus probably had five toes on each foot. The skull was low and triangular in shape, wider than it was long. The largest known skull measures 64.5 centimeters (25 in) long and 74.5 cm (29 in) wide. ![]() ______________________________________________________________________________
Edited by Taipan, May 25 2018, 11:58 PM.
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| TerrorBird | Feb 7 2012, 05:50 AM Post #46 |
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Autotrophic Organism
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Of course there wouldn't be any direct hard-evidence of false eye-spots on the tail-club because color-patterns are usually never preserved in the fossil record. //// I know there are no sauropods in T-rex's range but this forum is raising a hypothetical battle between T-rex and anklyosaurus, so that's the only reason why I'm talking about the defense-strategy of anklyosaurus. Edited by TerrorBird, Feb 7 2012, 05:50 AM.
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| TerrorBird | Feb 7 2012, 05:56 AM Post #47 |
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Autotrophic Organism
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Well, that's the pros & cons of evolution being that animals at first, develop a certain defense strategy or camoflage but then in time, the predators no longer become fooled by it, then evolution develops an altogether different defense-mechanism in the future generations of those animals. Edited by TerrorBird, Feb 7 2012, 10:44 AM.
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| Taipan | Jul 31 2012, 08:34 PM Post #48 |
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Try this one first. |
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| Jinfengopteryx | Jul 31 2012, 08:58 PM Post #49 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Well, if it tries to come close to the Ancylo, it will get hitten by the club. This would break it's hollow bones, also prey usually wins against the predator, but Ancylosaurus can't runaway, so it's kind of winning, must be different. |
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| Jinfengopteryx | Jul 31 2012, 09:00 PM Post #50 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Could you give any reasons for that claim, cause it seems very unlikely!!! |
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| Megafelis Fatalis | Jul 31 2012, 11:57 PM Post #51 |
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Carnivore
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Tyrannosaurus based on the 1.5m long skull, Ankylosaurus based on the largest skull (~65cm long)
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| Neofelis | Aug 1 2012, 12:48 AM Post #52 |
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Heterotrophic Organism
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I thought Anky was bigger but oh we'll. I vote trex 6/10 due to size advantage but that club could still hurt it and make it fall which would be fatal. |
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| Jinfengopteryx | Aug 1 2012, 12:53 AM Post #53 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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I ment for your claim that T-rex would mostly win, the scale is accurate. |
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| Cat | Aug 1 2012, 02:27 AM Post #54 |
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Omnivore
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If that size comparison is really accurate then I would lean towards T-rex, but there is no doubt that the tail club would still have been very dangerous for the predator. |
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| Jinfengopteryx | Aug 1 2012, 02:28 AM Post #55 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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It is accurate, but still, T-rex would've a ard job avoiding the club. |
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| Megafelis Fatalis | Aug 2 2012, 07:31 AM Post #56 |
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Carnivore
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Notice that the Tail is very short to be dangerous to Tyrannosaurus, and don't forget that Ankylosaurus had short legs, wide body and armor, which made it very very very slow |
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| Jinfengopteryx | Aug 2 2012, 05:52 PM Post #57 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Well, rhinos and hippos also can turn fast, even if their legs are short. The tail should be long enough to hit a leg |
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| 7Alx | Aug 2 2012, 05:59 PM Post #58 |
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Herbivore
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But rhino and hippo don't have armor unlike to Ankylosaurus. |
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| Jinfengopteryx | Aug 2 2012, 06:01 PM Post #59 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Still, even elephants can move fast and they're heavier than Ancylosaurus. |
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| 7Alx | Aug 2 2012, 08:15 PM Post #60 |
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Herbivore
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6 ton Ankylosaurus is weight of average Elephant. But Ankylosaurus is twice as short at height due short legs. If they are in equal height, anky would be much heavier. There is not possible that Ankylosaurus could run 40 km/h (Elephant's top speed). |
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