The song of Buff-collared Nightjar is described as "a striking, rapid, accelerating series of hollow clucks ending with a sharp note, ku-ku-kukukukuku-a-chia' , or koo-koo-kookookookoo-oo-chee'a" (Howell and Webb 1995). The song varies geographically "somewhat" in phrasing, "but the quality and effect is the same so that all are readily recognized" (Davis 1957). The song can be given at a rate of up to four repetitions/15 s (Davis 1957). The song primarily is given from March through August (Howell and Webb 1995).
For a representative audio recording with sonogram, see audio
Calls of Buff-collared Nightjar include "a low, clucking chuuk and kruk kruk, kruk ..., and harder, clucking chatters" (Howell and Webb 1995).