Nightjars are medium-sized nocturnal or crepuscular birds in the family Caprimulgidae / ˌkæprɪˈmʌldʒɪdiː / and order Caprimulgiformes, characterised by long wings, short legs, and very short bills. They are sometimes called bugeaters, [1] their primary source of food being insects. Some New World species are called nighthawks.