Eocypselus vincenti is an extinct species of prehistoric bird believed to be the ancestors of modern hummingbirds and swifts within the family Eocypselidae. It is known from the Fur Formation in the early Eocene of Denmark. It was described from a wing and pectoral bone from an individual found in the London Clay formation. The genus Eocypselus is thought to represent the earliest divergence between Apodiformes in hummingbirds and swifts. References Fossil taxa described in 1984 Birds described in 1984 Prehistoric birds of Europe Fossils of Denmark Eocene birds of Europe Apodiformes