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The Collaborative International Dictionary
goatsuckers

Caprimulgidae \Caprimulgidae\ n. [L. capris goat + mulgere to milk.] a widely distributed natural family of nocturnally active birds including the whip-poor-will ( Caprimulgus vociferus), the chuck-will's-widow ( Caprimulgus carolinensis), and the common nighthawk ( Chordeiles minor); -- called popularly the goatsuckers or nightjars. The nighthawks are sometimes active during the day.

Syn: goatsuckers, nightjars, family Caprimulgidae.

The family . . . is alternately known as the nightjars (derived from the "churring" sounds of several species -- "jarring" the night air), or goatsuckers, a nonsense name that should be discontinued as it has its origin in the preposterous myth that the birds sucked the milk of nanny goats until they were dry.
--Terence Michael Short (Wild Birds of the Americas)

Wiktionary
goatsuckers

n. (plural of goatsucker English)

Usage examples of "goatsuckers".

The journal confounds bats, which are winged mammals, with goatsuckers, or whippoorwills, which are birds.

Nothing but the eternal sounds of the night rising sweetly, peacefully, into the air: crickets and grasshoppers, goatsuckers sighing.