Scientists have found the fossil of a four-winged feathered dinosaur in China.
This unusual plumage helped the creature to slow down during flight and land safely, say researchers.
The bird-like creature is called Changyuraptor yangi, and lived 125 million years ago in Liaoning Province, north-east China.
At 132cm long, weighing over 4 kilograms, it is the biggest dinosaur of its type discovered.
And it's bigger than the largest flying birds around today, such as the albatross.
The well-preserved, complete skeleton has a long tail with 30cm feathers.
Four-winged dinosaurs, such as this, are known as microraptorines.