The external wing membrane or a fold-like membrane extending from the body of certain animals, especially the outer portion of a bat's wing.
From Greek 'ekto-' (outside) + 'patagium' (wing membrane, from 'pteron' wing). Specialized anatomical terminology developed in bat biology.
A bat's ectopatagium is studded with sensory hair cells that detect vibrations, turning their wings into super-sensitive touch organs alongside their famous sonar abilities!
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