Xu calls it a "four-winged" dinosaur because it had long, pennaceous feathers on its arms and legs.
Eventually, dense rows of interlocking barbs formed a flat surface: the basic blueprint of the so-called pennaceous feathers of modern birds.
Xu calls it a "four-winged" dinosaur because it had long, pennaceous feathers on its arms and legs.
Eventually, dense rows of interlocking barbs formed a flat surface: the basic blueprint of the so-called pennaceous feathers of modern birds.