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Sordes

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The most startling thing about the late Jurassic Sordes (which doesn't really deserve its name, which is Greek for "devil") is that it seems to have been covered by a fine coat of fur, or possibly primitive, hair-like feathers. Paleontologists have interpreted this coat as indicating that Sordes had an endothermic (warm-blooded) metabolism, since otherwise it wouldn't have needed to evolve this extra, mammalian layer of insulation. A type of pterosaur known as a rhamphorhynchoid, its closest relative was the eponymous, and slightly bigger, Rhamphorhynchus.