The coo coo coo call of the Yellow-billed Cuckoo (June, NJ).
The knocker call (June, NJ).
This is the nocturnal flight call (3.37am, May, PA)
(2.32am, May, PA)
(3.46am, May, PA)
Two Yellow-billed Cuckoos in close interaction made these calls (May, NJ).
Black-billed Cuckoo song (May, PA).
Both cuckoos vocalize frequently during nocturnal migration. The Black-billed Cuckoo makes a unique swallowing sound (2.45am, May, PA).
(12.26am, May, PA)
(2.03am, May, PA)
Flight call by perched bird (May, NJ).