Males make two calls that are directed at females, sometimes as a prelude to mating. One is a sequence of short squeaks; the other is made up of consecutive "ah" notes with 0.1 second between each note. These calls can be brief or last up to several minutes. Nestlings make a noisy grating begging call when seeking or expecting food. An adult female may also make the call while incubating the eggs. Immature birds also make a grating call not associated with begging that parents ignore.