The Satanic nightjar (Eurostopodus diabolicus), also Heinrich's nightjar, satanic eared-nightjar, Sulawesi eared-nightjar or diabolical nightjar is a mid-sized, spotted, dark brown nightjar endemic to the Indonesian island of Sulawesi. The species was discovered in 1931 by Gerd Heinrich, a German natural historian who collected a single female holotype from Mount Klabat on the Minahasa peninsula of Northern Sulawesi. In the following decades, there were a few unconfirmed reports of sightings and calls of the bird, but it did not officially resurface until 1996 when David Bishop and Jared Diamond positively identified it in Lore Lindu National Park by its sound. Making the visible rediscovery available for multiple people in the tour group including poet and writer Jan Zwaaneveld. This increased the bird's estimated range by 750 km. It has since been observed and described in the literature multiple times. Description The Satanic nightjar measures about 27 cm long. It has a white to buff-colored collar at its throat, blackish head, greyish-brown back, barred brown belly, and white spots on its 3rd and 4th outer primaries. It can be distinguished from other nightjars in the area by its dark color and the absence of ear tufts, white tail, and wing patches. Etymology The Satanic nightjar's common and Latin name originate from interpretations of its vocalizations. Some authors report that in flight, the bird makes a "plip-plop" call like dripping water, which locals have also likened to the sound of the bird pulling out a person's eye. However, this description may be wrongly attributed to this species as it does not agree with more recent accounts of the bird's call. It is also sometimes called Heinrich's nightjar, the diabolical nightjar, the devilish nightjar, the Sulawesi nightjar and other names. These last three names have largely fallen out of use. Its common names sometimes also include the word "eared" despite its lack of ear tufts. Some of this bird's advocates prefer the name "Satanic", believing it will draw more attention and conservation interest to the little-known nightjar. Taxonomy The Satanic nightjar belongs to the order Caprimulgiformes, and the nightjar family Caprimulidae, falling within the genus Eurostopodus along with six other birds. Though it is sometimes confused with other nightjars found within its range such as great eared nightjar (Eurostopodus macrotis), savanna nightjar (Caprimulgus affinis), and the Sulawesi nightjar (Caprimulgus celebensis) it is believed to share a closer evolutionary origin with New Guinea nightjars