The transitional fossils in Figure 2.21 demonstrate that dinosaurs evolved feathers long before they evolved flight. Clearly, feathers did not evolve for their aerodynamic advantages. What else,...

The transitional fossils in Figure 2.21 demonstrate that

dinosaurs evolved feathers long before they evolved

flight. Clearly, feathers did not evolve for their aerodynamic advantages. What else, besides aerodynamics, do feathers do for birds today? What advantages might

feathers have offered for dinosaurs? Can you think of a

way to test your hypothesis?