Antrostomus vociferous, better known as the eastern whip-poor-will or whip o whill, is a species of bird within the nightjar family, Caprimulgidae, which is endemic to the deciduous forests and mixed woodlands of North and Central America from Canada in the north to Costa Rica in the south and from the east coast to the great plains. Often migrating to the north of there range to breed and to the south of there range to overwinter. It is named onomatopoeically after its song as whilst the whip-poor-will is commonly heard within its range, it is rarely seen because of its elaborate camouflage. Eastern whip-poor-whills are a nocturnal species which spends there days resting amongst leaf litter, tree roots, branches, hollows, and fallen logs, emerging at night to feed upon various flying insects such as beetles, flies, mosquitos, and in particular moths. Eastern whip-poor-wills are generally solitary preferring to spend time on their own; however, during migration, they may form loose flocks. Reaching around 8.5 to 10.5 inches (22 to 27cms) in length, 1.5 to 3 ounces (42 to 85grams) in weight with a 17.5 to 19.5 inch (45 to 50cms) wingspan, eastern whip poor whills sport a large head and broad body. They have mottled camoflauged 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. Breeding often begins in March, with pairs meeting up and building a loose nest on the ground, in shaded locations among dead leaves. Here a female will usually lay 2 eggs at a time. Incubation lasts 19-21 days performed by both parents. Eastern Whip-poor-wills lay their eggs in phase with the lunar cycle, so that they hatch on average 10 days before a full moon. As when the moon is near full, the adults can better forage at night and capture large quantities of insects to feed to their young.The chicks hatch well developed covered in down but with their eyes closed. They are fed and protected by both parents and start to fly at the age of 20 days. Eastern whip-poor-wills usually produce 1 or 2 broods per year and females may lay a second clutch while the male is still caring for chicks from the first brood. Under ideal conditions an eastern whip poor will can live up to 15 years.