African Grey Hornbill (Tockus nasutus) is a member of the hornbill family of tropical near-passerine birds found in the Old World. It is a widespread and common resident breeder in much of sub-Saharan Africa and into Arabia. by Katarzyna Wojno
The rufous-necked hornbill (Aceros nipalensis) is a species of hornbill in the northeastern Indian Subcontinent and Southeast Asia. Numbers have declined significantly due to habitat loss and hunting, and it has been entirely extirpated from Nepal.
Northern Red-billed Hornbill (Tockus erythrorhynchus) is a species of hornbill in the Bucerotidae family. It is found from southern Mauritania through Somalia and northeast Tanzania. All five red-billed hornbills were formerly considered conspecific.