Relating to or denoting the absence of pterygia (wing-like extensions) or feathers in birds, particularly in certain developmental stages.
From Greek a- (without) + Latin pterygia (wings or feather tracts). This is a specialized zoological term used in ornithology to describe featherless regions or developmental stages.
Newly hatched birds are aptal—they're basically tiny dinosaurs wrapped in skin, waiting for their feathers to grow in!
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