Description
These medium-sized nightjars measure 22–27 cm (8.7–11 in) in length, span 45–50 cm (18–20 in) across the wings and weigh 42–69 g (1.5–2.4 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.
This bird is sometimes confused with the related Chuck-will's-widow (Antrostomus carolinensis) which has a similar but lower-pitched and slower call.
Read more about this topic: Whiporwill
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