Question

why birds do not fall when they sleep on a tree branch?

Answer 1

birds do not fall when they sleep on tree branches because they are able to keep a grip. they have thin tendron extending from the leg muscles down the back of the tarsus bone and are attached to the toes.these are called flexor .

Answer 2

Birds do not fall when they sleep on a tree because they are able to keep their grip .
specially perching birds can stay in place when they fall asleep on a tree or even a wire . They have tendons called flexor tendons that exytend from the leg muscles down the back of the tarsus bone and attach to the toes.