Allosaurus

This “different lizard” is so named due to the concave shape of the vertebrae, which were different from any other known dinosaur at the time of its discovery. It was named by Othniel Charles Marsh in 1877. One of the most popular and well-known dinosaurs, Allosaurus is one of the most common of the larger theropods. Over 100 partial skeletons have been found to date. This dinosaur has been found all throughout the western United States.

Artist Rendering of Allosaurus

One of the largest and most complete Allosaurus specimens ever found was recovered in 2001–2002. Discovered near Massadona, Colorado, this individual has been affectionately named Ebenezer and is on display at the Creation Museum in northern Kentucky.

Allosaurus was a large carnivorous theropod, standing approximately 10 feet high, weighing 2–3 tons, and reaching lengths of over 30 feet. One of its most notable features is the two crests above its eyes. These are thought to have been used to attract a mate or even to identify individuals.

The jaw of Allosaurus was weaker than other large carnivores and would have been better for slashing flesh rather than crushing bone. It also had long arms with sharp claws that would have been useful for slashing at prey, as well as holding it in place. Having a lightly built frame, this animal may have been able to run well over 20 mph.

Some evidence suggests this predator fought with the famed Stegosaurus. Tooth marks on the neck of one Stegosaurus match the teeth of Allosaurus. On the other hand, one of these predators was found with puncture marks on one of its tail vertebrae matching that of Stegosaurus’ tail spikes.

Popular in media, Allosaurus has made appearances in documentaries such as Walking with Dinosaurs and Planet Dinosaur. It has also recently made an appearance in Jurassic World: Fallen Kingdom, and a Jurassic World short film titled Battle at Big Rock.

October is “dinosaur month!” Every weekday of this month, you can come back to our Kids site to read about my 20 favorite dinosaurs. I hope you’ll join me!