Plural of apterygia; wingless appendages or structures, particularly referring to flippers in penguins and similar flightless birds.
From Greek a- (without) + pterygia (wings or wing-like structures). This zoological term specifically describes the modified flippers of flightless birds that lost the ability to fly through air.
Penguin apteryges are evolution's ultimate plot twist—they said 'we're getting rid of flying wings and getting swimming arms instead'!
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