bonaparte's nightjar Caprimulgus concretus

Small dark-brown nightjar of lowland forests. Bright white bib often noticeable. Male has silvery-white tips to the outer tail feathers; both sexes lack white in the wings. Nocturnal and extremely rarely encountered by day, when it roosts in thick, tangled foliage. Frequently hawks from a perch. Listen for its strange, mooing moan: “wuoOOOhwwhh”.