The diederik cuckoo was described by the French polymath Georges-Louis Leclerc, Comte de Buffon in 1780 in his Histoire Naturelle des Oiseaux from a specimen collected in the Cape of Good Hope region of South Africa.

[2] The bird was also illustrated in a hand-coloured plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text.

[3] Neither the plate caption nor Buffon's description included a scientific name but in 1783 the Dutch naturalist Pieter Boddaert coined the binomial name Cuculus caprius in his catalogue of the Planches Enluminées.

[4] The diederik cuckoo is now placed in the genus Chrysococcyx that was erected by the German zoologist Friedrich Boie in 1826.

Adult males are glossy green above with copper-sheened areas on the back and whitish underparts.