File:Allosaurus Rockies.jpg
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Skull of an Allosaurus fragilis on display at the Museum of the Rockies in Bozeman, Montana. (It is not clear where the specimen was collected.) The name "Allosaurus" means "different lizard", and "fragilis" means "fragile". This refers to Allosaurus' relatively lightweight skull and slender teeth. It was first discovered in 1877 by paleontologist Othniel Charles Marsh, and used to be known as Antrodemus. Allosaurus lived 155 to 150 million years ago. It averaged 28 feet in length, but could reach 40 feet. It had a relatively long and muscular tail, which helped it balance and turn quickly, and the skull had a pair of horns above and in front of the eyes. One of the most important Allosaurus finds came in 1991 with the discovery of "Big Al" in Big Horn County, Wyoming. "Big Al" was 95 percent complete, and partially articulated (so scientists didn't have to guess how the bones fit together or moved). "Big Al" is about 26 feet long. It is a subadult and only about 87 percent fully grown. it suffered some pathologies (disease and injury) in its left foot, which made it compensate during hunting with its right foot. This caused injury to the right foot. In 1996, a second Allosaurus, "Big Al Two", was discovered in almost the same location. Big Al Two is slightly larger, and slightly more complete. |
| Date | |
| Source | Allosaurus fragilis skull - Museum of the Rockies - 2013-07-08 |
| Author | Tim Evanson from Washington, D.C., United States of America |
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This image, originally posted to Flickr, was reviewed on 21 July 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 11:56, 21 July 2013 | | 2,500 × 1,656 (2.8 MB) | File Upload Bot (Magnus Manske) (talk | contribs) | Transferred from Flickr by User:FunkMonk using flickr2commons |
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