Resembling or sharing characteristics with swifts, particularly their aerial adaptations and streamlined body form.
From Greek kypséle (hollow place, referring to swift nests) combined with -oid (resembling). This term allows comparison of birds or animals that share swift-like features without being classified as true swifts.
Some swallows and hummingbirds look cypseloid—meaning they've evolved similar features to swifts through convergent evolution—proving that if you want to dominate the air, nature has only a limited number of body designs that work really well.
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