Meat eating dinosaurs

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Meat eating dinosaurs

Postby Chris Sergeant » Fri Feb 25, 2011 5:11 pm

70 million year jawbone of what appears to be a Gorgosaurus was found in 1996 in southern Alberta. Embedded in the jaw was the tip of a tooth from another meat-eating dinosaur. The wound showed no signs of healing, so the dinosaur died soon after it was inflicted. The fossil record shows that Gorgosaurus, a 10-metre long cousin of the bigger Tyrannosaurus rex, outnumbered other meat-eating dinosaurs in the area. So the attacker and the victim could both be Gorgosaurus.
Published in the journal Lethaia.
http://www.sciencedaily.com/releases/20 ... 155909.htm

Paleontologists have found bite marks on T. rex bones that were made by other T. rex, according to a study published online in the journal PLoS ONE.
Initially a bone was discovered with especially large gouges. Given the age and location of the fossil, the marks had to be made by T. rex, as this was the only big carnivore in western North America 65 million years ago. A search through a few dozen T. rex bones from several different museum fossil collections, discovered a total of three foot bones (including two toes) and one arm bone that showed evidence of T. rex cannibalism.
The marks are definitely the result of feeding, although scientists aren't sure whether they are the result of scavengers or the end result of fighting.
The marks do appear to have been made some time after death.
http://www.sciencedaily.com/releases/20 ... 185836.htm

Scientists working in Madagascar uncovered evidence of cannibalism in fossilized bones of Majungatholus atopus, a toothy beast the size of a small school bus that was the top hunter 70 million years ago on the island off east Africa. Researchers examining 21 bones from two nearly full-grown specimens taken from separate quarries on the island found evidence of intensive feeding in the backbone area. Sets of parallel tooth marks on the spine and ribs of the specimens matched the size and spacing of Majungatholus' blade-like teeth.
Researchers ruled out the only other known meat-eating dinosaur in the area - Masiakasaurus knopfleri - because its teeth were too small. They also discounted carnivores like crocodiles that have blunt, irregular teeth.
Reported in the journal Nature.
http://www.redorbit.com/news/science/14 ... cannibal/#
Chris Sergeant
 
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