Which of the following behaviors allows a bird to maintain a constant body temperature in extremely hot weather?

ASpreading wings
CFlattening feathers
BPanting
DAll of the above

User: Bird bones are adapted for flight because they

Aare dense
Care hollow
Bcontain bone marrow
Dare longer than the bones of most animals

Verified Answer :

d. All of the above

These behaviors;

Spreading wings
Flattening feathers
panting

are all evolutionary process to maintain body temperature. Birds are warm-blooded animals. Also known asĀ 
homeotherms, which is defined as having the constant body temperature. This is a vital function for the survival of the specie.

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c. are hollow

The bones of most birds are hollow in order for the weight of the birds to be light for them to fly.