Scientists have discovered a new type of flying reptile which they believe could explain a missing link in the development of the creatures.
More than 20 fossil skeletons of a reptile called the Darwinopterus have been discovered in north-east China in rocks around 160 million years old.
The reptiles, which were about the size of crows, had long jaws, rows of sharp-pointed teeth and flexible necks.
Experts think it was a bit like a hawk and snacked on other flying creatures.
It's prey is thought to have included tiny gliding mammals and small pigeon-sized, meat-eating dinosaurs.
These tiny creatures had feathered arms and legs, had recently started flying and eventually evolved into birds.