The Klaas's cuckoo (Chrysococcyx klaas), is a diminutive and striking bird, measuring between 16 to 18 centimeters in length. This species is characterized by its sexual dimorphism, with males displaying a glossy green plumage and unmarked white underparts, while females exhibit a bronze-brown body with greenish wing coverts and subtly barred white underparts. Both sexes possess a small white post-ocular patch, adding to their distinctive appearance.
When identifying the Klaas's cuckoo, look for the male's glossy green body and stark white underparts, contrasted by dark primaries in flight. Females can be recognized by their bronze-brown coloration and faint barring on the underparts. The white post-ocular patch is a key feature to observe in both sexes.
This cuckoo species is native to the wooded regions of sub-Saharan Africa, where it can be found flitting among the trees and shrubbery.
The Klaas's cuckoo graces much of sub-Saharan Africa with its presence, with the notable exception of the more arid regions in the south-west.
The call of Klaas's Cuckoo is a distinctive and melodious whistle, often described as a series of clear, descending notes that can sound like a repetitive "may-kee, may-kee". Males are known for their persistent and loud calling, especially during the breeding season, as they seek to attract mates and assert their territory.
Breeding habits are not specified, but as a member of the cuckoo family, it may engage in brood parasitism, laying its eggs in the nests of other bird species.
The Klaas's Cuckoo is most easily confused with the Diederik Cuckoo.
Klaas's Cuckoo primarily feeds on a variety of insects, with a particular preference for caterpillars, including those from moth and butterfly species. This diet also encompasses insects such as beetles, wasps, ants, and flies, making them an important natural control for pest populations in their habitats.
The Klaas's cuckoo is currently classified as Least Concern on the IUCN Red List, indicating that, at present, there are no immediate threats to its population numbers.