Researchers has revealed the color and detailed feather pattern of Microraptor, a pigeon-sized, four-winged dinosaur that lived about 130 million years ago. The non-avian dinosaur's fossilized plumage, which had hues of black and blue like a crow, is the earliest record of iridescent feather color.
The researchers also made predictions about the purpose of the dinosaur's tail. Once thought to be a broad, teardrop-shaped surface meant to help with flight, Microraptor's tail fan is actually much narrower with two elongate feathers. The researchers think that the tail feather was ornamental and likely evolved for courtship and other social interactions, not for aerodynamics. link
"The plumage don't enter into it. It's stone dead!"