Whip-poor-Will. 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 which has a similar but lower-pitched and slower call.