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Wakinosaurus was a meat-eating dinosaur from the early Cretaceous era, about 144-125 million years back.

Walgettosuchus was a meat-eating dinosaur from the early Cretaceous era, about 119-113 million years back.

Walkeria was a meat-eating dinosaur from the late Triassic era, about 231-225 million years back. This little, primitive, bipedal theropod did not have a brow edge (unlike most theropods).

Wannanosaurus  was a small homalocephalid dinosaur about 2 feet (60 cm) long

Warm-blooded Unlike cold-blooded animals, a warm-blooded animal doesn't need to stretch out to keep warm.

Williamsonia is a fossil plant that thrived from the Triassic era through the Cretaceous era.

Woolungosaurus was a flippered marine reptile from the early Cretaceous era.

Wuerhosaurus dinosaur that was found in Wuerho, Mongolia, China. It was about 27 feet (8.1 m) long and was like to Stegosaurus, but had smaller plates and front legs, wider hips, and a shorter body.