Question

how are the bones of birds different from those of other vertebrates

Answer 1

Hey mate here is your answer:-

Most birds have lightweight skeletons and their bones lack bone marrow (hollow bones). Unlike other animals, birds have the two clavicles fused forming the furcula or bone-wish which is both flexible and strong enough to support the shoulder girdle during flapping. The many fused bones in birds including the collar bone and the bone-wish make the skeleton flexible for flight. Birds also have their sternums larger relative to the other body parts. The large sternum provides sturdy attachment points of wing muscles. For this reason, birds tend to be different from other animals.

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Answer 2

there bones are hollow which reduces there body weight and help them to fly