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

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

Lucas Bustamante / Southern yellow billed hornbill (Tockus leucomelas) perched on branch, Etosha National Park, Harare Province, Namibia.

Lucas Bustamante / Southern yellow-billed hornbill (Tockus leucomelas) on ground, Moremi Game Reserve, Botswana.

Jen Guyton / Southern yellow-billed hornbill (Tockus leucomelas) in Kruger National Park, South Africa.

Jen Guyton / Southern yellow-billed hornbills (Tockus leucomelas) guarding their nest hole in a tree, Kruger National Park, South Africa.

Loic Poidevin / Southern yellow billed hornbill (Tockus leucomelas) male in tree, Kenya

Ann & Steve Toon / Southern yellowbilled hornbills (Tockus leucomelas) courtship display. Kruger National Park, South Africa. September.

Wim van den Heever / Southern Yellow-Billed Hornbill (Tockus leucomelas) yawning while sitting on the ground, Sabi Sand Game Reserve, South Africa

Neil Aldridge / Southern yellow-billed hornbill (Tockus leucomelas) perched on a broken branch, Kruger National Park, South Africa.

Neil Aldridge / Portrait of a Southern yellow-billed hornbill (Tockus leucomelas) in early morning. Kruger National Park, South Africa.

Neil Aldridge / Portrait of a Southern yellow-billed hornbill (Tockus leucomelas) in woodland, Kruger National Park, South Africa.

Neil Aldridge / Southern yellow-billed hornbill (Tockus leucomelas) searching for food in leaf litter, Kruger National Park, South Africa.

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

Christophe Courteau / Portrait of a Southern yellow billed hornbill {Tockus leucomelas}, Okavango Delta, Botswana.

Brent Stephenson / Southern Yellow-billed Hornbill (Tockus leucomelas) perched in a shrub in evening light. Kruger National Park, South Africa, January.

Chris Gomersall / Male Southern yellow billed hornbill (Tockus leucomelas) perched in acacia tree, Etosha National Park, Namibia, November

Tim Laman / Southern yellow-billed hornbill (Tockus leucomelas) perched on rock, with Impala in background. Kruger National Park, South Africa.

Tim Laman / Southern yellow-billed hornbill (Tockus leucomelas) perched on thorn bush. Kruger National Park, South Africa.

Jouan & Rius / Southern Yellow billed Hornbill (Tockus leucomelas) Etosha NP, Namibia

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

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} Kruger National Park, South africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} Kruger National Park, South Africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} preening, Kruger National Park, South Africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} Kruger National Park, South africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} preening, Kruger National Park, South Africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} preening, Kruger National Park, South Africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} preening, Kruger National Park, South Africa

Gabriel Rojo / Southern yellow billed hornbill {Tockus leucomelas} preening, Kruger National Park, South Africa

David Shale / Southern yellow billed hornbill {Tockus leucomelas} Kruger NP, South Africa

Paul Hobson / Southern yellow billed hornbill {Tockus leucomelas} Namibia

Wild Shots Outreach / Southern yellow-billed hornbill (Tockus leucomelas) in tree, Kruger National Park. South Africa. Picture taken by pupil Chris Mojela during Wild Shots Outreach Residential Course.

Eric Baccega / Southern yellow-billed hornbill (Tockus leucomelas) perched on branch, Okavango Delta, Botswana, Africa.

Guy Edwardes / Southern yellow-billed hornbill (Tockus leucomelas) in flight. Savuti, Botswana.

Guy Edwardes / Southern yellow-billed hornbill (Tockus leucomelas) perched on branch, portrait. Savuti, Botswana.

Pedro Narra / Southern yellow-billed hornbill (Tockus leucomelas) head portrait, Moremi Game Reserve, Botswana.

Pedro Narra / Red-billed Hornbill (Tockus erythrorhynchus), and a Southern yellow-billed hornbill (Tockus leucomelas), Moremi Game Reserve, Botswana.