especially those of the giant sphinx moth (Cocytius antaeus) and the Orion cecropian butterfly (Historis odius). Young are fed crickets and cockroaches. Its foraging technique varies by habitat, including hunting at ground level by short flights, gleaning from understory plants, and probing in Guzmania sanguinea bromeliads on Sacoglottis holdridgei trees. In addition to caterpillars and other arthropods, it also occasionally eats Anolis towsendi, an endemic lizard. Breeding The Cocos cuckoo breeds during the dry season of January to mid-April. Both members of a pair build the flimsy stick cup nest with no lining, and usually place it on a smallish branch of a small tree. Two such nests were both about above the ground, and both were partially shielded by leaves. Both sexes share incubation and parental care. The clutch size is not definitely known but is believed to be one or two. The incubation period is not known but is thought to be similar to the nine to 12 days of others of its genus. The time to fledging is also not known. Vocalization As of late 2022, xeno-canto had no recordings of the Cocos cuckoo's vocalizations and the Cornell Lab of Ornithology's Macaulay Library had only three. The song is described as "a guttural Eeh-eeh-eeh-eeh-eeh-eeeh-eeeehh" and is most frequently sung during the breeding season, and then between dawn and noon. Status The IUCN has assessed the Cocos cuckoo as Vulnerable. It has a very small range. Its estimated population of between 250 and 1000 mature individuals is believed to be stable. Feral cats, pigs, and goats, as well as deer, are potential threats - the first as a predator and the others as damaging to the species' habitat. Disturbance from tourism is also increasing, and climate change is another potential threat. References Cocos cuckoo Endemic birds of Costa Rica Cocos cuckoo Taxonomy articles created by Polbot