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Temporal range: Upper Cretaceous
Skeleton restoration
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Alvarezsauridae
Genus: Alvarezsaurus
Bonaparte, 1991

A. calvoi Bonaparte, 1991 (type)

Alvarezsaurus is a small dinosaur from the Upper Cretaceous of Argentina, about 86-83 million years ago. It measured about 2 meters in length and weighed 20 kilograms.

It was named by paleontologist Jose Bonaparte in 1991. It walked on two legs, had a long tail, and its leg structure suggests that it was a fast runner. It may have eaten insects. It was more primitive than other, better-known members of its family, such as Mononykus and Shuvuuia.

In popular culture[change | change source]

Alvarezsaurus was featured in the Discovery Channel television series Dinosaur Planet, which speculated that it was a predator of young Saltasaurus, although these species did not exist at the same time, Alvarezsaurus being about 5 million years older than Saltasaurus.