Question

Besides pneumatic bones, another useful flight adaptation in birds is

• A. Syrinx
• B. Pygostyle
• C. Furcula
• D. Quill feathers

Answer 1

Answer: (D)

Quill feathers

Besides pneumatic bones, another useful flight adaptation in birds is quill feathers. Each quill feather has a central stem or scapus. It is divided into a lower hollow part called the quill or calamus and a solid upper part termed rachis. Small filaments or barbs are attached to rachis. The barbs remain attached with one another to form a continuous blade for striking the air in flight.

So, the correct answer is 'Quill feathers'.