A black-billed cuckoo perches on a branch.

Black-billed Cuckoo

The black-billed cuckoo is separated from the yellow-billed by its all-black bill, lack of rufous in the wings, and muted undertail pattern, which barely shows contrast between the gray and white spots. The common call is a long soft series of cu notes, all at the same speed and pitch.

Hear the black-billed cuckoo:

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