The Common Swift (Apus apus) is a medium-sized bird, superficially similar to the Barn Swallow or House Martin but somewhat larger. It is, however, completely unrelated to those passerine species, since swifts are in the separate order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles. Swifts' nearest relatives are thought to be the New World hummingbirds and the Southeast Asian treeswifts.
Their scientific name comes from the Ancient Greek words α "without", and πούς, "feet". ἄπους, apous, meaning "without feet". These birds have very short legs which they use only for clinging to vertical surfaces (hence the German name Mauersegler, literally meaning "wall-glider"). They never settle voluntarily on the ground, where they would be vulnerable to accidents and predation.
Read more about Common Swift: Taxonomy, Description, Parasites, In Heraldry, Gallery
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—Michel de Montaigne (1533–1592)
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Jerry: Yeah, you know, American college kids. They come over here to take their third year and lap up a little culture. They give me a swift pain.
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—Alan Jay Lerner (1918–1986)