A bat's feet lock into place while it hangs — ChillScroll

A little brown bat sleeping upside down from a pale cave ceiling

A bat's feet lock into place while it hangs

Small ridges inside the tendon sheaths of a bat's feet act like a ratchet. Once the toes curl around a perch, the grip can stay closed without the bat using extra energy.

Feet on the ceiling, wings folded, completely normal bat bedtime.

Source · Bat Conservation International ↗