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Hornbills are in the family Bucerotidae consisting of two subfamilies and 13 genera. Most are in the subfamily Bucerotinae with 51 species. The hornbills in Discovery Cover were:

Subfamily Bucerotinae all but ground hornbills
Red-billed Hornbill Tockus erythrorhynchus
Trumpter Hornbill
Bycanistes bucinator
Von der Decken’s Hornbill Tockus deckeni
Subfamily Bucorvinae Ground Hornbills
Southern Ground Hornbill Bucorvus leadbeaten