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"Unusual feather morphotypes on the legs, feet, and tail suggest that first generation feathers in the Enantiornithes may have been much more like contour feathers than the natal down observed in many modern birds. However, these regions also preserve filamentous feathers that appear comparable to the protofeathers observed in more primitive theropods."
Link: https://www.sciencedirect.com/science/article/pii/S1342937X17300527
Link: https://www.sciencedirect.com/science/article/pii/S1342937X17300527