When birds are sleeping on tree branches they do not fall off as birds have a tendon locking mechanism so when they start to fall asleep their grip on the branch gets tighter. The deeper they fall into sleep the tighter their grip gets therefore they do not fall off.


feet
feet

SONG BIRDS or PERCHING BIRDS (warblers, thrushes, wrens, etc.) have independent, flexible toes, with one pointing backwards, ideal for grasping perches. Why don't perching birds fall out of trees when they sleep? When perching 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 release.
feet
feet

WOODPECKERS have two toes pointing forwards and two backwards; for climbing up, down, and sideways on tree trunks.
feet
feet

WATER BIRDS such as ducks have webbing between their toes for swimming. GULLS also have feet similar to these so they don't sink while walking in the soft sand or mud near the water's edge.
feet
feet

WADING BIRDS. The long toes of herons, which spreads the bird's weight over a large surface area, facilitates walking on soft surfaces near the water's edge (where wading birds like to eat).
feet
feet

RAPTORS such as hawks, eagles, and owls use large claws (called talons) to capture, kill, and carry prey with their feet.
feet
feet

Pheasants and chickens use their strong feet to scratch the dirt and leaf litter to uncover seeds and insects.
feet
feet

Strong-legged flightless birds, like the cassowary, protect themselves by kicking with their powerful feet and sharp claws.

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