Nesting of Dark-billed Cuckoo (coccyzus Melacoryphus) on Isabela Island, Galapagos, Ecuador

We present new data and reviewed the information available on the breeding biology of the Dark-billed Cuckoo (Coccyzus melacoryphus), a widespread South American species. We collected opportunistic observations from three nests in a mangrove forest on Isabela Island, Galapagos Archipelago, Ecuador. The nests were built in forks of White Mangrove (Laguncularia racemosa) branches 5 to 9 m above the ground. They were low/cup-shaped, with intertwined branches on the outside and leaves, stipules, and strips of stem bark in the inner cup. The clutch size was three eggs, which were light green and sub-elliptical in shape. The nestling period lasted between 7 and 8 days. We observed biparental care during incubation and brooding. In addition, we documented the parasitism of the Avian Vampire Fly (Philornis downsi) on Dark-billed Cuckoo chicks.