Abelisaurus
"Abel's lizard" has been reconstructed from a single skull.

Achillobator
This fierce raptor was discovered in modern-day Mongolia.

Acrocanthosaurus
The largest predator of the early Cretaceous period.

Adasaurus
This raptor's hind claws were unusually small.

Aerosteon
This "air-boned" dinosaur may have breathed like a bird.

Afrovenator
One of the few carnivores ever to be dug up in north Africa.

Albertonykus
A tiny, birdlike, North American dinosaur.

Albertosaurus
This carnivore was a close cousin of T. Rex.

Alectrosaurus
Few specimens of this "unmarried lizard" have been found.


Alioramus
All we know...

Aardonyx
An early stage in the evolution of sauropods.

Abrictosaurus
An early relative of Heterodontosaurus.

Abrosaurus
A close Asian relative of Camarasaurus.

Abydosaurus
The intact skull of this sauropod was discovered in 2010.

Acanthopholis
No, it's not a city in Greece.

Achelousaurus
Might this have been a growth stage of Pachyrhinosaurus?

Acristavus
This early hadrosaur lacked any ornamentation on its skull.

Acrotholus
North America's earliest bone-headed dinosaur.

Adamantisaurus
This titanosaur was named 50 years after its discovery.


Adeopapposaurus
A close relative of Massospondylus.

Aegyptosaurus
Guess...