Whether they’re opening for takeoff, spreading wide for a lazy soar or flapping to brake for landing, bird wings make flying look almost effortless.

Most of a bird’s power production for flight occurs in the breast muscles. This mass of meat — pectoralis muscle for the powerful downstroke on top of the supracoracoideus muscle for the upstroke — is ...

New Haven, Conn. — The evolutionary path from dinosaurs to birds included the development of a tiny wrist bone that ultimately proved crucial for stabilizing wings in flight. A new study suggests that ...