Question

Which of the following features is characteristic of birds but not reptiles?

• A. Hollow bones
• B. Tail
• C. Eyes
• D. Lay eggs

Answer 1

Answer: (A)

Hollow bones

With hollow bones, a bird can fly very long distances without getting worn out from carrying its own weight. Hollow bones look like other bones, with the usual hard exterior like a human bone has. But instead of being filled with marrow (as in humans), a hollow bone has an air cavity inside.

So, the correct option is A.