Neil Aldridge / Southern yellow-billed hornbill (Tockus leucomelas) displays while calling in winter, Kruger National Park, South Africa.

John Waters / Southern Yellow billed Hornbill {Tockus leucomelas} Kalahari Desert, Northern Cape, South Africa

Andrew Parkinson / Yellow billed hornbill {Tockus flavirostris} Etosha NP, Namibia

Ann & Steve Toon / Southern redbilled hornbill (Tockus rufirostris), Zimanga game reserve, South Africa.

Staffan Widstrand / Southern Yellow-billed Hornbill, (Tockus leucomelas) tossing a fly larva at a carrion site, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Southern Yellow-billed Hornbill, (Tockus leucomelas), eating fly larvae at a carrion site, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

John Shaw / Southern red-billed hornbill male (Tockus rufirostris) Mahatsu Reserve, Botswana, June.

Bernard Castelein / Indian Grey Hornbill (Ocyceros birostris), Keoladeo NP, Bharatpur, India

Bernard Castelein / Indian Grey Hornbill (Ocyceros birostris), Keoladeo NP, Bharatpur, India

Suzi Eszterhas / Yellow-billed hornbill (Tockus flavirostris) perched in tree with food in beak. Sabi Sands Game Reserve, South Africa.

Bernard Castelein / Western red billed hornbill (Tockus kempi) feeding on fruit, Gambia.

Bernard Castelein / Western red billed hornbill (Tockus kempi) feeding on fruit, Gambia.