The skeleton of a tiny reptile which lived 120 million years ago has been found in China.
Photo: Michael Skrepnickaption
The creature lived in trees, had a wingspan of just 30cm and was about the size of a sparrow.
It's been called the Nemicolopterus crypticus - which means "hidden flying forest dweller".
The reptile was a pterosaur - a family of creatures which lived alongside dinosaurs. They are also called pterodactyls.
Experts say it's unusual that this reptile is so small as some pterosaurs were the size of a small plane. This creature was probably one of the smallest pterosaurs around.
Photo: PNAS/National Academy of Sciences
The fossil also shows the flying creature had no teeth, curved feet and ate insects.
A fossil is the remains of something that lived long ago.
It is usually preserved in rock and can tell us a lot about animals and plants that lived millions of years ago and have now become extinct.