Cuckoos are secretive, eat lots of caterpillars and are mostly heard not seen. Black-billed Cuckoos breed in forest habitats across much of the upper two-thirds of the U.S. from MT east and into southern Canada. Listen for their low pitched cu cu cu cu call. Tell them from the similar Yellow-billed Cuckoo by their black bill and red-eye ring. Yellow-billed Cuckoo has a yellow lower mandible and yellowish eye-ring and its breeding range extends across much of the eastern two-thirds of the U.S. Look for them now!
Listen to Black-billed Cuckoo here,
Listen to Yellow-billed Cuckoo here,
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