 The golden-crowned manakin was formed 180,000 years ago by hybridization between snow-capped and opal-crowned manakins.Rapidly diverging species can sometimes form multiple hybrid species, giving rise to a species complex, like several physically divergent but closely related genera of cichlid fishes in Lake Malawi.The duck genus "Anas" (mallards and teals) has a very recent divergence history, many of the species are inter-fertile, and quite a few of them are thought to be hybrids.