Eucavitaves is a clade that contain the order Trogoniformes (trogons) and the clade Picocoraciae (a large assemblage of birds that includes woodpeckers, kingfishers, hornbills and hoopoes). The name refers to the fact that the majority of them nest in cavities.
Leptosomatiformes (cuckoo roller)
Bucerotiformes (hornbills and hoopoes)
Coraciiformes (rollers and kingfishers)
Piciformes (woodpeckers and toucans)
Cladogram of Eucavitaves relationships based on Jarvis, E.D. et al. (2014) with some clade names after Yury, T. et al. (2013) and Kimball 2013.