Scientists have found bits of other gliding dinosaurs before but not with feathers, and they've never found one with four wings.
The fossil shows the dinosaur's feathers
Now they're trying to work out where the Microraptor Gui fits into the way dinosaurs and birds are linked through evolution.
Some people think the fossil find shows how some dinosaurs learned to glide between trees - like a parachute - and then over millions of years worked out how to fly.
Others think they ran along the ground building up speeds before taking off - like a plane.
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