Allosaurus One of the most common predators of the Jurassic era.

Altirhinus This "high-nosed" plant eater resembled an early hadrosaur.

Alvarezsaurus A bird-like dinosaur of the late Cretaceous.

Alxasaurus An early relative of the bizarre Therizinosaurus.

Amargasaurus A bizarre, spined sauropod from South America.

Amazonsaurus One of the few dinosaurs to be found in the Amazon basin