MicroFactzzz#0065 · 🐙 Animal Chaos
A bat spends zero muscle energy hanging upside down
Tendons in a bat's feet clamp shut mechanically under the weight of its own body, so hanging costs it essentially no energy at all.
A bat spends most of the day hanging head-down, gripping the ceiling of a cave or a branch with the claws of its hind feet — a position that would quickly exhaust a human's muscles.
In a bat, the mechanism works completely differently: the tendons connecting the claws to the rest of the foot act like a ratchet that clamps shut automatically under the weight of the body, keeping the claw locked closed without any active muscle contraction at all.
That lets a bat hang for hours — even after death, its feet stay clamped shut without any muscle tension, until something physically pries the tendon open the other way.
The bigger picture: birds perching on a branch while asleep use this same "energy-free" mechanism — an independently evolved but strikingly similar solution to the same problem: how to rest without losing your grip.
Sources
- General knowledge / encyclopedic sources
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Krulicza Nora
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