Bended toes of the bat feet serve like clothes hanger, it is enough to hook them against rough surface, and there hangs the bat. However the bat’s toes do not5 always stay in the clenched position. They have to be pulled by the tendons, which we move using our muscles, but in bats they are not even fixed to the muscles and they are pulled by the weight of the animal’s body, instead. Once hanging, the bat does not spend energy to stay in position, and remains hanging during hibernation and even after its dead. To straighten the toes, bat must use its muscles.

The sharp, little claws help the bat to find a place where to hang, even with very small roughness. However the answers referring only to this aspect but not mentioning the mechanism keeping the toes bended where not considered complete and were rejected.

Additional adaptations of bat legs include reverse angle of their knee, which lets them walk on their four, without dragging their knees against the surface.

Each toe contains the tendon blocking system, which helps to bend the finger and keep it clenched with no effort.

Their feet can turn widely, easing up hanging on surfaces of any shape.

The winners selected randomly amongst correct answers: Karol Szczygieł, Agnieszka Kiełtyka i Ewa Przepiórka. Congratulations!
The next, May competition coming soon.