Black-and-white Owl produces deep, gruff, barking hoots that suggest the call of Mottled Owl (Ciccaba virgata) but are less resonant and usually more emphatic (Howell and Webb 1995). The most common call variously is described as "a deep, resonant, deliberate hu, hu, hu, hóo-ah (last phrase slurred)" (Hilty and Brown 1986); as "a low grunt followed by a gruff, strident hoot huh, HOOoo" (Stiles and Skutch 1989); and as "an emphatic huwhoOOo" and variations on this, including a "series of 3-5 or more notes, last or penultimate note emphatic, woh-who-WHOW'woh or ha-ha-ha HAH, etc." (Howell and Webb 1995). Other vocalizations include a "fairly rapid series of 8-10 notes, whuk-whuk-whuk …, [and] a harder heh-heh-heh" (Howell and Webb 1995); a single loud, deep boo or whoou, given at intervals (Hilty and Brown 1986, Hilty 2003); and a scream or screech, variously described as "loud, wailing screams, wheeahew or meeeowh" (Howell and Webb 1995) or as "a high-pitched, dry scream, rising then falling, catlike and strained as though only air is being expelled" (Hilty 2003). Calls of females are similar to those of the male but are slightly higher pitched (König and Weick 2008). Females have been observed vocalizing from the nest (Gerhardt et al. 1994b). Young birds have a more breathy, ascending shriek (Stiles and Skutch 1989).