A) Because of the shape of their claws that hold on to the branch very firmly.
B) Birds do not sleep on the branches, they sleep in their nests.
C) Because their feathers balance their weight.
D) None of these
Correct Answer: A
Solution :
When birds sit, a tendon on the backside of the ankle automatically flexes locking their toes around the branch. With feet locked, sleeping birds don't fall. As the bird stands up its feet releases.
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