Whistling long-tailed cuckoo
The whistling long-tailed cuckoo is a species of cuckoo in the family Cuculidae. It is distributed in West Africa west of the Bakossi Mountains, from Sierra Leone west to eastern Cameroon.
It was formerly thought to be a disjunct western population of the dusky long-tailed cuckoo, which it is morphologically indistinguishable from, but it was later split from C. mechowi on account of its different vocalizations. The whistling long-tailed cuckoo has two distinct songs: one described by Nigel James Collar and Peter Boesman as a song of "three rising notes" and a Halcyon kingfisher-esque song described by Collar and Boesman as "plaintive whinnying". On the other hand, the dusky long-tailed cuckoo has two different songs: a song described by Collar and Boesman as "three similar, less melodious notes" and a fast, descending song. These song differences led to the description of C. lemaireae as a distinct species.
