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ZpleB TIL that possum’s “playing dead” behavior is not a conscious behavior. Instead it is an instinctive reflex and they enter a catatonic-like state though they can remain mentally aware of the situation.
VBLPp TIL that birds have a unidirectional, four-stroke respiration system. They have posterior and anterior air sacs that fill the lungs and receive deoxygenated air during each part of the inhale/exhale cycle. This process is highly efficient as it keeps the lungs constantly full of oxygenated air
Egd6W TIL cicada wings shed water, dirt, and bacteria and are anti-reflective to avoid detection by predators using nanopillars 4000x thinner than human hair and waxy substances