Onychognathus is a genus of
starlings, most of which are found in Africa.
All the species are quite similar, and characterised by rufous primary wing feathers, very obvious in flight. The males are typically mainly glossy black, and the females have dull (sometimes dark, depending on species) grey heads.
^Jobling, J.A. (2018). del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (eds.).
"Key to Scientific Names in Ornithology". Handbook of the Birds of the World Alive. Lynx Edicions. Retrieved 11 May 2018.