» This article's about the bird. For the aircraft, see Gloster Nightjar. Nightjars are medium-sized nocturnal or crepuscular birds with long wings, short legs and very short bills. They're sometimes referred to as goatsuckers from the mistaken belief that they suck milk from goats (the Latin for goatsucker's Caprimulgus). Some North American species are named as nighthawks. Nightjars usually nest on the ground. Nightjars are found around the world. They're mostly active in the late evening and… (More on Nightjar)