What characteristic of Xiaotingia zhengi's feathers was noted on its femur and suggested possible hindlimb wing use?
Answer
Long pennaceous feathers measuring up to 55 millimeters
The feathers covering Xiaotingia zhengi were extensively distributed across the body, including the head, body, forelimbs, and hind limbs. Critically, the feathers found specifically on the femur were quite long, reaching measurements up to 55 millimeters. Furthermore, the text highlights the presence of long pennaceous feathers on both the tibia and metatarsus (feet). The existence of these substantial feathers on the lower leg and foot leads to the hypothesis that if Xiaotingia had any limited flight capability, it might have utilized these highly feathered hind limbs as secondary wings, a concept also considered for Archaeopteryx.
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