 The topazes and jacobins combined have the oldest split with the rest of the hummingbirds.The hummingbird family has the second-greatest number of species of any bird family (after the tyrant flycatchers).Fossil hummingbirds are known from the Pleistocene of Brazil and the Bahamas; however, neither has yet been scientifically described, and fossils and subfossils of a few extant species are known.