Cocos Cuckoo Coccyzus ferrugineus
Version: 2.0 — Published October 22, 2020
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Sounds and Vocal Behavior
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Vocalizations of Cocos Cuckoo have not been studied in detail, and there are no known audio recordings of this species. The song consists of a guttural Eeh-eeh-eeh-eeh-eeh-eeeh-eeeehh.. During copulation, a similar vocalization is given, but consisting only of short Eeeh notes separated one from other for 1-2 s, rather than the longer, more continuous series. A begging call given by the juvenile is a brief guttural call chur-rr; this call is repeated every 2-5 seconds, sometimes for up to 45 minutes, and increases in both frequency and volume when an adult appears, until the juvenile is fed (1).
Song is heard most frequently during the breeding season (January-mid April); otherwise the cuckoo is very quiet; this, and its generally stealthy behavior, makes the cuckoo perhaps the most difficult bird to detect on the island.
Daily Pattern of Vocalizing
Singing is more frequent during mornings (from dawn to noon) (1).
Places of Vocalizing
Usually sings from the midstory or canopy, at least 10 m above the ground; observed only once singing at ground level (1).