5. Bucerotiformes - Hornbills, Hoopoes and Wood Hoopoes

Bucerotiformes is an order that contains the hornbills, hoopoe and wood hoopoes. The wood hoopoes are a morphologically distinct group, unlikely to be mistaken for any other. They have metallic plumage, often blue, green or purple, and lack a crest.

The hoopoe is a colourful bird found across Afro-Eurasia, notable for its distinctive "crown" of feathers. It is the only extant species in the family Upupidae.

The ground hornbills (Bucorvidae) are a family of the order Bucerotiformes, with a single genus Bucorvus and two extant species. The family is endemic to Sub-Saharan Africa: the Abyssinian ground hornbill occurs in a belt from Senegal east to Ethiopia, and the southern ground hornbill occurs in Southern and East Africa. Ground hornbills are large, with adults around a metre tall.

The hornbills (Bucerotidae) are a family of bird found in tropical and subtropical Africa, Asia and Melanesia. They are characterized by a long, down-curved bill which is frequently brightly colored and sometimes has a casque on the upper mandible.