Skip to Main Navigation. Each navigation link will open a list of sub navigation links.

Skip to Main Content

Apply to the University of Wyoming

Global Resource Navigation

Visit Campus
Download UW Viewbook
Give to UW
University of Wyoming Geological Museum

Contact Us

Department of Geology and Geophysics

1000 E. University Ave., Dept. 3006

Laramie, WY 82071

Phone: 307-766-2646

Email: geolmus@uwyo.edu

Find us on Facebook (Link opens a new window) Find us on Twitter (Link opens a new window)

Geological Museum

Department of Geology and Geophysics

Big Al the Allosaurus

Allosaurus

"Different Lizard"

Geologic Time: Late Jurassic, ~145 to 155 million years ago

Geographic Range: Wyoming, Montana, Colorado, New Mexico, South Dakota, Utah, and Oklahoma

Adult Weight: 1.5 - 2 tons

Adult Length: 30 - 40 ft long

Habitat: Plains and lowlands

Diet: Meat 

Allosaurus was the most common large carnivore of the Late Jurassic in North America. It was a smaller predecessor of the Cretaceous Tyrannosaurus. Strong forelimbs with sharp claws, powerful hind legs and recurved, dagger-like teeth are evidence that Allosaurus was a formidable predator. Although it was much smaller than sauropods like Apatosaurus (Brontosaurus), which were also common at the time, quite possibly Allosaurus hunted in packs to bring down larger prey. Like many meat eaters, it may also have been a scavenger.

This specimen of Allosaurus shows evidence of injuries that may have resulted in the animal's death at a relatively young age. "Big Al" was featured in the BBC's "Walking With Dinosaurs: Allosaurus" video.

"Big Al" Allosaurus
"Big Al" the Allosaurus

Share This Page:

1000 E. University Ave. Laramie, WY 82071
UW Operators (307) 766-1121 | Contact Us | Download Adobe Reader

Twitter Icon Youtube Icon Instagram Icon Vimeo Icon Facebook Icon

Accreditation | Emergency Preparedness | Employment at UW | Gainful Employment | Privacy Policy | Accessibility Accessibility information icon