The Nightjar family is a bird because its order is the Caprimulgiformes which is part of the Aves class, therefore being a bird. Birds are "feathered, winged, bipedal, endothermic, egg-laying, vertebrae animals". All of which, the Nightjar has, therefore being a bird.
The Nightjar has some interesting habits which are unusual such as perching along a branch, rather than across it. They are also nocturnal, although this is not unusual. Nighjar's are also in ancient foklore and were thought to suck the milk from goats. The Latin for 'goatsucker' is also, Caprimulgus. This is how Caprimulgiformes was derived.
Bates's Nightjar was created in 1906.
Todd's Nightjar was created in 1915.
Collared Nightjar was created in 1871.
Jerdon's Nightjar was created in 1845.
Mees's Nightjar was created in 2004.
Well, most nightjar species are not endangered. HOWEVER, the Puerto Rican Nightjar was listed as endangered in 1973.
Long-tailed Nightjar was created in 1825.
Slender-tailed Nightjar was created in 1892.
Long-trained Nightjar was created in 1850.
Square-tailed Nightjar was created in 1857.
New Zealand Owlet-nightjar was created in 1968.
bird