The satanic nightjar (Eurostopodus diabolicus), also known as satanic eared nightjar, Sulawesi eared nightjar, diabolical nightjar or Heinrich's nightjar, is a medium-sized, approximately 27 cm long, greyish brown spotted nightjar with dark crown, barred brown below and small white spot on the third and fourth outer primaries wing feathers. Due to ongoing habitat loss, small population size and limited range, the satanic nightjar is evaluated as "Vulnerable" on the IUCN Red List of threatened species.