Diederik cuckoo either "cuprea" (coppery) or "capensis" (of Cape of Good Hope). The English name is an onomatopoeic rendition of its call. Diederik cuckoo The Diederik cuckoo ("Chrysococcyx caprius"), formerly dideric cuckoo or didric cuckoo, and sometimes called Diederik's cuckoo, is a member of the cuckoo order of birds, the Cuculiformes, which also includes the roadrunners and the anis. The diederik cuckoo is a smallish cuckoo at 18 to 20 cm. Adult males are glossy green above with copper-sheened areas on the back and whitish underparts. They have a broken white eye-stripe and a short, green malar stripe. All remiges have three
Thick-billed cuckoo helmetshrike, the thick-billed cuckoo has caused probably the most dramatic reduction in nesting success by any brood parasitic bird, with one group of helmetshrikes unable to rear any of their own nestlings for five years and ten breeding attempts, with overall between 35 and 55 percent of nests parasitised. It is almost certain that the extinct Malagasy subspecies parasitised vangas, which are related to the helmetshrikes. This species’ parasitism of the helmetshrikes may complement the similarly sized black cuckoo which exclusively parasitises bush shrikes. Thick-billed cuckoo The thick-billed cuckoo ("Pachycoccyx audeberti") is a species of cuckoo in the family Cuculidae.