The Eastern Whip-poor-will is a medium-sized (2227 cm) nightjar bird from North and Central America. The whip-poor-will is commonly heard within its range, but less often seen because of its superior camouflage. It is named onomatopoeically after its song. These medium-sized nightjars measure 2227 cm (8.711 in) in length, span 4550 cm (1820 in) across the wings and weigh 4269 g (1.52.4 oz). Among standard measurements, the wing chord is 14.7 to 16.9 cm (5.8 to 6.7 in), the tail is 10.5 to 12.8 cm (4.1 to 5.0 in), the bill is 1 to 1.4 cm (0.39 to 0.55 in) and the tarsus is 1.5 to 1.8 cm (0.59 to 0.71 in). Adults have mottled plumage: the upperparts are grey, black and brown; the lower parts are grey and black. They have a very short bill and a black throat. Males have a white patch below the throat and white tips on the outer tail feathers; in the female, these parts are light brown.