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Nighthawks are birds of the nightjar family in the New World subfamily Chordeilinae. They are medium-sized nocturnal birds with long wings, short legs and very short bills that usually nest on the ground and catch flying insects. The Least Nighthawk, at 16 cm (6.3 inches) and 23 grams, is the smallest of all Caprimulgiformes. Nightjars are sometimes referred to as goatsuckers from the mistaken belief that they suck milk from goats (the Latin for goatsucker is Caprimulgus).

Nighthawk

Nighthawks are birds of the nightjar family in the New World subfamily Chordeilinae. They are medium-sized…

"In ornithology, having the beak broad and deeply cleft, as a swallow, swift, or goatsucker" or nightjar. -Whitney, 1911

Fissirostral Bill of Nightjar

"In ornithology, having the beak broad and deeply cleft, as a swallow, swift, or goatsucker" or nightjar.…

<i>Siphonorhis americana</i>. "A genus of American <i>Caprimulgidae</i> or goatsuckers, having tubular nostrils. The only species, <i>S. americana</i> inhabits Jamaica." &mdash;Whitney, 1889

Nightjar Profile and Tubular Nostrils

Siphonorhis americana. "A genus of American Caprimulgidae or goatsuckers, having tubular nostrils. The…

The Oilbird or Guacharo (Steatornis caripensis) is a bird in the Steatornithidae family, related to the nightjars.

Oilbird

The Oilbird or Guacharo (Steatornis caripensis) is a bird in the Steatornithidae family, related to…

"Antrostomus vociferus. Whippoorwill. Night-jar. Upper parts variegated with gray, black, whitish, and tawny; prevailing tone gray; black streaks sharp on the head and back, the colors elsewhere delicately marbled, including the four median tail-feathers; wings and their coverts with bars of rufous spots; lateral tail-feathers black, with large white (male) or small tawny (female) terminal spaces; a white (male) or tawny (female) throat-bar. Adult male: Assuming stone-gray as the ground-color of the upper parts: Crown with a purplish cast, heavily dashed lengthwise with black; back darker, with smaller streaks; tail beautifully marbled with slate-gray and black tending crosswise on the 4 middle feathers; scapulars with bold black centre-fields set in frosty marbling; hind neck with white specks, as if continued around from the white throat-bar. Primaries black, with a little marbling at their ends, fully broken-barred with tawny-reddish; no white spaces. Three lateral tail-feathers mostly black, with pure white terminal spaces 1-2 inches long. Under parts quite blackish, on the breast powdered over with hoary-gray, more posteriorly marbled with gray and tawny, tending crosswise. Lores and ear-coverts dark brown. It is only in perfect plumage that the colors are as slaty and frosty as described; ordinarily more brown and ochrey." Elliot Coues, 1884

Large Whippoorwill

"Antrostomus vociferus. Whippoorwill. Night-jar. Upper parts variegated with gray, black, whitish, and…

"Antrostomus vociferus. Whippoorwill. Night-jar. Upper parts variegated with gray, black, whitish, and tawny; prevailing tone gray; black streaks sharp on the head and back, the colors elsewhere delicately marbled, including the four median tail-feathers; wings and their coverts with bars of rufous spots; lateral tail-feathers black, with large white (male) or small tawny (female) terminal spaces; a white (male) or tawny (female) throat-bar. Adult male: Assuming stone-gray as the ground-color of the upper parts: Crown with a purplish cast, heavily dashed lengthwise with black; back darker, with smaller streaks; tail beautifully marbled with slate-gray and black tending crosswise on the 4 middle feathers; scapulars with bold black centre-fields set in frosty marbling; hind neck with white specks, as if continued around from the white throat-bar. Primaries black, with a little marbling at their ends, fully broken-barred with tawny-reddish; no white spaces. Three lateral tail-feathers mostly black, with pure white terminal spaces 1-2 inches long. Under parts quite blackish, on the breast powdered over with hoary-gray, more posteriorly marbled with gray and tawny, tending crosswise. Lores and ear-coverts dark brown. It is only in perfect plumage that the colors are as slaty and frosty as described; ordinarily more brown and ochrey." Elliot Coues, 1884

Small Whippoorwill

"Antrostomus vociferus. Whippoorwill. Night-jar. Upper parts variegated with gray, black, whitish, and…