Traditionally, Caprimulgiformes were regarded, on morphological grounds, as being midway between the owls (Strigiformes) and the swifts. Like the owls, they are nocturnal hunters with a highly developed sense of sight, and like the swifts they are excellent flyers with small, weak legs. At one time or another, they have been allied with owls, swifts, kingfishers, hoopoes, mousebirds, hornbills, rollers, bee-eaters, woodpeckers, trogons and hummingbirds. A close relationship to owls can be rejected since there is strong molecular evidence that owls are members of a clade, called Telluraves, that excludes Caprimulgiformes.