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

Martin van Lokven / Ground Hornbill (Bucorvus leadbeateri) predating young Leopard Tortoise (Geochelone pardalis), Ngorongoro Conservation Area, Tanzania

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.

Juergen & Christine Sohns / Ground Hornbill (Bucorvus leadbeateri), Kruger National Park, 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.

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 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.

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

Ashish & Shanthi Chandola / Southern red-billed hornbill (Tockus erythrorhynchus) Kruger National Park, South Africa, July.

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.

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

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.

Walter Soestbergen / Ground Hornbill (Bucorvus leadbeateri) carrying grasshopper prey, South 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

Murray Cooper / Ground Hornbill (Bucorvus leadbeateri) male, Kruger National Park, South Africa

Richard Du Toit / Ground Hornbill (Bucorvus leadbeateri) in tree, Kruger National Park, South Africa

Matthias Breiter / Ground Hornbill (Bucorvus leadbeateri), Okavango Delta, Botswana

Richard Du Toit / Ground Hornbill (Bucorvus leadbeateri) juvenile, Chobe National Park, Botswana

Vincent Grafhorst / Ground Hornbill (Bucorvus leadbeateri) male on the Khwai River floodplain with an insect in its bill, Moremi Game Reserve, Okavango Delta, Botswana

Vincent Grafhorst / Ground Hornbill (Bucorvus leadbeateri) juvenile in the grass of the Khwai River floodplain, Moremi Game Reserve, Okavango Delta, Botswana

Richard Du Toit / Ground Hornbill (Bucorvus leadbeateri) adult calling in grassland, Chobe National Park, Botswana

Piotr Naskrecki / Ground Hornbill (Bucorvus leadbeateri) group feeding on Cape Warthog (Phacochoerus aethiopicus) carcass, Gorongosa National Park, Mozambique

Juergen & Christine Sohns / Ground Hornbill (Bucorvus leadbeateri), Kruger National Park, South Africa

Juergen & Christine Sohns / Ground Hornbill (Bucorvus leadbeateri), Kruger National Park, South Africa

Martin Willis / Ground Hornbill (Bucorvus leadbeateri), Chobe National Park, Botswana

Heini Wehrle/ BIA / Ground Hornbill (Bucorvus leadbeateri) with insect prey, Mpumalanga, South Africa

Juergen & Christine Sohns / Ground Hornbill (Bucorvus leadbeateri) feeding on insect, Hluhluwe-Umfolozi Game Reserve, South Africa

D. Parer & E. Parer-Cook / Ground Hornbill (Bucorvus leadbeateri) feeding on insect, Ngorongoro Conservation Area, Tanzania

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.

Bernard Castelein / Female Abyssinian ground hornbill (Bucorvus Abyssinicus) walking along riverbank, Allahein River, The Gambia.

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.