Mussaurus is known only from fossilized eggs and infant skeletons, which are about 8 to 15 inches (20 to 37 centimeters) long, but adults are believed to have grown to about 10 feet (3 meters) in length and weighed around 150 pounds (70 kilograms).
The infant skeletons that have been found, have very unusual proportions (including short snouts and large eyes) compared to an adult prosauropod, however it is known that they are definitely prosauropods from the examination of pelvic and limb bones. Although no adult fossils of Mussaurus have yet been found, it is believed that its proportions would be closer to those typical for prosauropods.
The name "Mussaurus" means "mouse lizard", and could be said to be something of a misnomer, given the adults were not unusually small.
Mussaurus was a herbivore (plant-eater) that lived about 215 million years ago
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