Neil Aldridge / Southern ground hornbill (Bucorvus leadbeateri) juvenile with an adult bird close by on the Selinda Reserve in northern Botswana. Vulnerable.

Richard Du Toit / Southern ground hornbill (Bucorvus leadbeateri) on ground, Chobe National Park, Botswana

Richard Du Toit / Southern ground hornbill (Bucorvus leadbeateri) Kruger National Park, Limpopo Province; South Africa.

Richard Du Toit / Ground hornbill (Bucorvus leadbeateri) pair, Kruger National Park, Limpopo Province, South Africa.

Tony Heald / Ground hornbill (Bucorvus leadbeateri) in flight, South Luangwa NP. Zambia. July.

Anup Shah / Southern ground hornbill (Bucorvus leadbeateri) male collecting food including lizard, snake and frog, Maasai Mara National Reserve, Kenya.

Neil Aldridge / Southern ground hornbill (Bucorvus leadbeateri) perched in a dead tree during summer, Kruger National Park, South Africa.

Richard Du Toit / Ground hornbill (Bucorvus leadbeateri) walking on road, Kruger National Park, South Africa.

Richard Du Toit / Ground hornbill (Bucorvus leadbeateri) portrait, Kruger National Park, South Africa.

Ashish & Shanthi Chandola / Southern ground hornbill (Bucorvus leadbeateri) male, Kruger National Park, South Africa, July.

Oliver Scholey / Ground hornbill (Bucorvus leadbeateri) feeding on frog, Masai Mara, Kenya.

Will Burrard-Lucas / Ground hornbill {Bucorvus leadbeateri} walking on the ground, South Luangwa National Park, Zambia. April.

Richard Du Toit / Ground Hornbill (Bucorvus leadbeateri) Kruger National Park, Limpopo Province, South Africa, October.

Wim van den Heever / Southern ground hornbill (Bucorvus leadbeateri) breaking open a termite mound, Chobe National Park, Botswana.

Loic Poidevin / Southern Ground Hornbill (Bucorvus leadbeateri) foraging, Masai Mara, Kenya.

Lou Coetzer / Southern ground hornbill (Bucorvus leadbeateri) in flight, Chobe River, Botswana, Vulnerable species.

Eric Baccega / Southern Ground Hornbill (Bucorvus leadbeateri) feeding on insect, Masai Mara National Reserve, Kenya, Africa.

Denis-Huot / Ground hornbill (Bucorvus leadbearti) portrait, Nakuru National Park, Kenya

Denis-Huot / Ground hornbill (Bucorvus leadbearti) catching an insect, Masai-Mara Game Reserve, Kenya

Denis-Huot / Ground hornbill (Bucorvus leadbearti) catching a snake, Masai-Mara Game Reserve, Kenya

Denis-Huot / Ground hornbill (Bucorvus leadbearti) catching a hare, Masai-Mara Game Reserve, Kenya

Charlie Summers / Southern Ground hornbill (Bucorvus leadbeateri) gathering nesting material in a riverbed in Lake Manyara National Park, Tanzania

Charlie Summers / Southern Ground hornbill (Bucorvus leadbeateri) gathering nesting material in a riverbed in Lake Manyara National Park, Tanzania

Ole Jorgen Liodden / Southern Ground Hornbill (Bucorvus leadbeateri) about to catch a large beetle in its beak. Masai Mara, Kenya, September.

Anup Shah / Southern ground hornbill (Bucorvus leadbeateri)Masai Mara National Reserve, Kenya

Mary McDonald / Ground hornbill (Bucorvus leadbeateri / cafer)hunting, with grasshopper caught in mid air, wings spread, Masai Mara Game Reserve, Kenya, East Africa, Vulnerable species

Brent Stephenson / Male Southern Ground-hornbill (Bucorvus leadbeateri) hunting for prey in long grass. Kruger National Park, South Africa, January.

Pete Oxford / Southern Ground Hornbill (Bucorvus leadbeateri). Kruger National Park, South Africa, December.

Konstantin Mikhailov / Ground hornbill (Bucorvus leadbeateri) captive, from South Africa

Konstantin Mikhailov / Ground hornbills (Bucorvus leadbeateri) captive, from South Africa

Anup Shah / Southern ground hornbills (Bucorvus cafer) feeding on a carcass. Masai Mara National Reserve, Kenya, September 2009

Anup Shah / Female Southern Ground- hornbill (Bucorvus leadbeateri) feeding. Masai Mara National Reserve, Kenya. March

Patricio Robles Gil / Southern Ground Hornbill (Bucorvus leadbeateri) resting in shade, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill (Bucorvus leadbeateri) resting in shade, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill ( bucorvus leadbeateri) juvenile feeding on snake that has been given to it by the adult, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill ( bucorvus leadbeateri) juvenile feeding on snake that has been given to it by the adult, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill (Bucorvus leadbeateri) carrying tortoise prey to nest, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill (Bucorvus leadbeateri) feeding on tortoise prey, Kruger NP, South Africa

Patricio Robles Gil / Southern Ground Hornbill (Bucorvus leadbeateri) flying to nest with food for chicks, Kruger NP, South Africa

Piper Mackay / Adult and juvenile Southern ground-hornbill(Bucorvus leadbeateri / cafer) interacting, Masai Mara, Kenya

Tim Laman / Southern Ground hornbill (Bucorvus leadbeateri / cafer) male in the grass. Kruger National Park, South Africa.

Tim Laman / Southern Ground hornbill (Bucorvus leadbeateri / cafer) female portrait. Kruger National Park, South Africa.

Tim Laman / Southern Ground hornbill (Bucorvus leadbeateri / cafer) dust bathing to clean feathers of parasites, Kruger National Park, South Africa.

Tim Laman / Southern Ground hornbill (Bucorvus leabeateri / cafer) in flight. Kruger National Park, South Africa.

Tim Laman / Southern Ground hornbill (Bucorvus leadbeateri / cafer) chick in nest hollow in Baobab tree. Kruger National Park, South Africa.

Tim Laman / Southern ground hornbill (Bucorvus leadbeateri / cafer) crushes skull of mouse it has captured before swallowing, Kruger National Park, South Africa.

Tim Laman / Southern Ground Hornbill (Bucorvus leadbeateri / cafer) in Giant bayobab nest tree, Kruger National Park, South Africa.

Klaus Nigge / Southern ground hornbill (Bucorvus leadbeateri) juvenile, perched on termite mound, Tarangire National Park, Tanzania.

Richard Flack / Ground hornbill (Bucorvus leadbeateri) perched at entrance to nest hole with mouse prey in beak, Pafuri, Kruger National Park, South Africa.

Richard Flack / Ground hornbill (Bucorvus leadbeateri) with mouse prey in beak, portrait, Pafuri, Kruger National Park, South Africa. Cropped.

Charlie Hamilton-James / Ground hornbill (Bucorvus leadbeater) catching insect in beak, Masai Mara, Kenya, Africa.

Tim Laman / Southern ground hornbill (Bucorvus cafer) with red facial skin and neck, head portrait, Kruger National Park, Republic of South Africa.

Tim Laman / Three Southern ground hornbills (Bucorvus cafer) walking through savanna grassland, with Zebra (Equus sp.) in background, Kruger National Park, Republic of South Africa.

Maxime Aliaga / Southern ground hornbill (Bucorvus leadbeateri) with a snake in its beak, Masai Mara National Reserve, Kenya.

Maxime Aliaga / Southern ground hornbill (Bucorvus leadbeateri) with an insect in its beak, Masai Mara National Reserve, Kenya.

Guy Edwardes / Southern ground hornbill (Bucorvus leadbeateri) in grassland. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Southern ground hornbill (Bucorvus leadbeateri) profile. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Southern ground hornbill (Bucorvus leadbeateri) feeding on insect in grassland. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Southern ground hornbill (Bucorvus leadbeateri), two feeding in grassland. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Southern ground hornbill (Bucorvus leadbeateri) hunting in grassland. Savuti, Chobe National Park, Botswana.

Neil Aldridge / Southern ground hornbill (Bucorvus leadbeateri) calling to its mate with a snake in its bill, Maasai Mara National Reserve, Kenya.

Neil Aldridge / Southern ground hornbill (Bucorvus leadbeateri) calling to its mate with a snake in its bill, Maasai Mara National Reserve, Kenya.

Neil Aldridge / Southern ground hornbill (Bucorvus leadbeateri) calling to its mate with a snake in its bill , Maasai Mara National Reserve, Kenya.

Anup Shah / Southern ground-hornbill (Bucorvus leadbeateri) female, Masai Mara National Reserve, Kenya.