Changes

====Bite strength====

====Bite strength====

Recent estimates based on computer models, scale models of skulls, and comparisons with living animals suggest T-rex had one of the strongest bites of any animal.  Experiments conducted by Dr. Gregory Erickson when he was a graduate student at the University of California (Berkeley) determined that a minimum of 1,440 pounds of pressure from its front teeth alone could put a 11.5 mm-deep hole in bone, while 3,011 pounds of pressure came from its back teeth [http://news-service.stanford.edu/pr/96/960827tyrexbite.html][http://science.discovery.com/videos/mammals-vs-dinos-t-rex-bite-force.html][http://news.nationalgeographic.com/news/2006/04/0405_060405_trex_video.html][http://videos.howstuffworks.com/discovery/28239-assignment-discovery-tyrannosaurus-rexs-bite-force-video.htm].  The strength of the bite may have been as much as four tons or more, according to Dr. Eric Snively of the University of Alberta, who discovered the significance of fused nasal bones unique to T-rex.  "Fused, arch-like nasal bones are a unique feature of tyrannosaurids," he said. "This adaptation, for instance, was keeping the T. rexes from breaking their own skull while breaking the bones of their prey."  A fused nasal bone channels the force of the bite from the skull to the prey item; this, with the combination of extremely-powerful neck muscles, convinced Dr. Snively and his colleagues that an adult T-rex could potentially use 200,000 newtons of force when pulling meat off a carcass. [http://www.livescience.com/animals/070518_dino_nose.html]

Recent estimates based on computer models, scale models of skulls, and comparisons with living animals suggest T-rex had one of the strongest bites of any animal.  Experiments conducted by Dr. Gregory Erickson when he was a graduate student at the University of California (Berkeley) determined that a minimum of 1,440 pounds of pressure from its front teeth alone could put a 11.5 mm-deep hole in bone, while 3,011 pounds of pressure came from its back teeth [http://news-service.stanford.edu/pr/96/960827tyrexbite.html][http://science.discovery.com/videos/mammals-vs-dinos-t-rex-bite-force.html][http://news.nationalgeographic.com/news/2006/04/0405_060405_trex_video.html][http://videos.howstuffworks.com/discovery/28239-assignment-discovery-tyrannosaurus-rexs-bite-force-video.htm].  The strength of the bite may have been as much as four tons or more, according to Dr. Eric Snively of the University of Alberta, who discovered the significance of fused nasal bones unique to T-rex.  "Fused, arch-like nasal bones are a unique feature of tyrannosaurids," he said. "This adaptation, for instance, was keeping the T. rexes from breaking their own skull while breaking the bones of their prey."  A fused nasal bone channels the force of the bite from the skull to the prey item; this, with the combination of extremely-powerful neck muscles, convinced Dr. Snively and his colleagues that an adult T-rex could potentially use 200,000 newtons of force when pulling meat off a carcass. [http://www.livescience.com/animals/070518_dino_nose.html]

== Fossils ==

== Fossils ==