Eucavitaves is a clade that contains the order Trogoniformes (trogons) and the clade Picocoraciae (a large assemblage of birds that includes woodpeckers, kingfishers, hornbills and hoopoes).[1][2][3][4][5][6] The name refers to the fact that the majority of them nest in cavities.
Cladogram of Eucavitaves relationships based on Jarvis, E.D. et al. (2014)[6] with some clade names after Yuri, T. et al. (2013)[7] and Kimball 2013.[5]