Juergen & Christine Sohns / African Wild Dog (Lycaon pictus) group attacking Cape Warthog (Phacochoerus aethiopicus), Tswalu Game Reserve, South Africa

Suzi Eszterhas / Cape Warthog (Phacochoerus aethiopicus) parent and juvenile drinking at waterhole, Mashatu Game Reserve, Botswana

Bence Mate / African buffalo (Syncerus caffer) and Warthog (Phacochoerus africanus) at night with full moon, Mkuze, South Africa Third place in the Nature Portfolio category of the World Press Photo Awards 2017.

Neil Aldridge / Warthog (Phacochoerus africanus) with a Yellow-billed oxpecker (Buphagus africanus) on its back, nuzzling its mother at a waterhole, Chief's Island, Okavango Delta, Botswana.

Neil Aldridge / Red-billed oxpeckers (Buphagus erythrorhynchus) adult and young on the back of Common warthog (Phacochoerus africanus) through grassland in summer Mapungubwe National Park, South Africa.

Cyril Ruoso / Eastern Chimpanzee (Pan troglodytes schweinfurthii) , Frodo the dominant male and hunter, eating a Red River Hog (Potamochoerus porcus) piglet with two females begging, Gombe National Park, Tanzania

Cyril Ruoso / Cape Warthog (Phacochoerus aethiopicus) tusks, hunting trophies that get checked in customs in regard to CITES and local law, France

Edwin Giesbers / Red river hog (Potamochoerus porcus) close up of head, captive

Sandesh Kadur / Pygmy Hog (Porcula salvania) foraging. Captive, member of a reintroduction project. Assam, eastern India.

Sandesh Kadur / Pygmy Hog (Porcula salvania) seen through undergrowth. Captive, member of a reintroduction project. Assam, eastern India.

Bert Willaert / Hognosed Pit Viper (Porthidium nasutum) coiled. Ecuador, South America.

Bernard Castelein / Hog Deer (Cervus / Axis / Hyelaphus porcinus) crossing a stream. Kaziranga National Park, Assam, India, February.

Konrad Wothe / Domestic Pig (Sus scrofa domesticus) on grassy lawn, Germany

Gerry Ellis / Cape Warthog (Phacochoerus aethiopicus) portrait, Kenya

ZSSD / Red River Hog (Potamochoerus porcus) pair standing face to face, a highly social bush pig, native to Africa

ZSSD / Red River Hog (Potamochoerus porcus) four babies, a highly social bush pig, native to Africa

ZSSD / Red River Hog (Potamochoerus porcus) baby and mother interacting, a highly social bush pig native to West Africa

Anup Shah / Male Hog deer {Axis porcinus} with Oxpecker bird Kaziranga NP, Assam, India

Ann & Steve Toon / Warthog (Phacochoerus africanus) with Redbilled oxpecker (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) drinking, with redbilled oxpeckers (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) drinking, with redbilled oxpecker (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) sounder on the move, Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Redbilled oxpecker (Buphagus erythrorhynchus) searching for insects on Warthog (Phacochoerus africanus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Juergen & Christine Sohns / African Wild Dog (Lycaon pictus) group surrounding Cape Warthog (Phacochoerus aethiopicus), Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Wild Dog (Lycaon pictus) group attacking Cape Warthog (Phacochoerus aethiopicus), Tswalu Game Reserve, South Africa

Nick Garbutt / Humboldt's hog-nosed skunk (Conepatus humboldtii). Torres del Paine National Park, Patagonia, Chile. November.

Yashpal Rathore / African elephant (Loxodonta africana) and Warthog (Phacochoerus africanus) waiting near waterhole. Savuti, Chobe National Park, Botswana.

Staffan Widstrand / Common Warthog (Phacochoerus africanus) portrait, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus), with a Red-billed Oxpecker (Buphagus erythrorhynchus) eating its ticks and other parasites, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus) close up of eye and 'warts' Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus), with an African / Cape Buffalo in the foreground, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus) reflected in water hole, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus), with a Red-billed Oxpecker (Buphagus erythrorhynchus) eating its ticks and other parasites, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Common Warthog (Phacochoerus africanus) silhouetted, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Daniel Heuclin / Babiroussa (Babyrousa babyrussa) covered in mud, Sulawesi, captive.

Daniel Heuclin / Babiroussa (Babyrousa babyrussa) standing in water, Sulawesi, captive.

Daniel Heuclin / Babiroussa (Babyrousa babyrussa) covered in mud, Sulawesi, captive.

Suzi Eszterhas / African elephant (Loxodonta africana) herd at waterhole during dry season with Springbok (Antidorcas marsupialis), Plains zebra (Equus quagga) and Warthog (Phacochoerus africanus). Etosha National Par...

Will Watson / Water Hog-louse or Water Slater (Asellus aquaticus) on sallow leaf, Herefordshire Plateau, England, December 2018. Captive.

Will Watson / Water Hog-louse or Water Slater (Asellus aquaticus) with exopod regrowing, sallow leaf, captive conditions, garden pond, Herefordshire Plateau, England, December 2018.

Melvin Grey / Hog-nosed pit viper (Porthidium nasutum) Atlantic Lowland Rainforest, Costa Rica.

Paul Hobson / Hognosed pitviper (Porthidium nasutum). Costa Rica.

Ann & Steve Toon / Warthogs (Phacochoerus africanus) Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Whitebacked vultures (Gyps africanus) threat display to Warthog (Phacochoerus africanus) Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.

Sylvain Cordier / Humboldt's hog-nosed skunk (Conepatus humboldtii) Torres del Paine National Park, Patagonia, Chile.

Sylvain Cordier / Hog deer (Axis porcinus or Hyelaphus porcinus ) male with antlers, Kaziranga National Park, Assam, India.

Sylvain Cordier / Humboldt's hog-nosed skunk (Conepatus humboldtii) Torres del Paine National Park, Patagonia, Chile.

Juergen & Christine Sohns / Cape Warthog (Phacochoerus aethiopicus) male at waterhole, Addo National Park, South Africa

Jen Guyton / Warthogs (Phacochoerus africanus) captured in a net to be translocated to Maputo Special Reserve, Gorongosa National Park, Mozambique. October 2016.

Jen Guyton / Warthogs (Phacochoerus africanus) captured in a net to be translocated to Maputo Special Reserve, Gorongosa National Park, Mozambique. October 2016.

Jen Guyton / Warthog (Phacochoerus africanus) being led to a truck to be translocated to Maputo Special Reserve, Gorongosa National Park, Mozambique. October 2016.

Jen Guyton / Warthog (Phacochoerus africanus) caught as part of trans-location program to Maputo Special Reserve. Gorongosa National Park, Mozambique.

Ann & Steve Toon / Warthog (Phacochoerus africanus) walking, Zimanga private game reserve, KwaZulu-Natal, South Africa, September.

Eric Baccega / African lion (Panthera leo) female suffocating a common warthog prey (Phacochoerus africanus), Masai Mara National Reserve, Kenya.

Eric Baccega / African lion (Panthera leo) female suffocating a common warthog prey (Phacochoerus africanus), Masai Mara National Reserve, Kenya.

Eric Baccega / African lion (Panthera leo) female suffocating a common warthog prey (Phacochoerus africanus), Masai Mara National Reserve, Kenya.

Naskrecki & Guyton / Nile monitor lizards (Varanus niloticus) converging on last remaining puddle of water in the Mussicadzi River to hunt Sharpooth catfish (Clarias gariepinus). Baboons (Papio sp.), a warthog (Phacochoer...

Eric Baccega / Four Burchell's zebra (Equus quagga burchellii) two with Red billed oxpeckers (Buphagus erythrorynchus) on their backs, with Antelope, mainly Impala (Aepyceros melampus) and a Warthog (Phacochoerus af...

Heidi & Hans-Juergen Koch / Domestic Pig (Sus scrofa domesticus) nose, Borken, North Rhine-Westphalia, Germany

Ernie Janes / Warthog (Phacochoerus africanus) portrait, Namibia

Richard Du Toit / Warthog (Phacochoerus africanus) female with two juveniles, Itala Game Reserve, KwaZulu-Natal Province, South Africa.

Richard Du Toit / Warthog (Phacochoerus africanus) Itala Game Reserve, KwaZulu-Natal Province, South Africa.

Sandesh Kadur / Indian hog deer (Hyelaphus porcinus) Manas National Park UNESCO World Heritage Site, Assam, India.

Sandesh Kadur / Indian hog deer (Hyelaphus porcinus) mother and fawn, Manas National Park UNESCO World Heritage Site, Assam, India.

Sandesh Kadur / Indian hog deer (Hyelaphus porcinus) Manas National Park UNESCO World Heritage Site, Assam, India.

Ingo Arndt / Cape Warthog (Phacochoerus aethiopicus) adult male / with Yellow-billed Oxpecker (Buphagus africanus) adult sitting on head and calling, Masai Mara National Reserve, Kenya

Silke Arndt / Male Common warthog (Phacochoerus africanus) feeding on a dead Blue wildebeest (Connochaetes taurinus), with White-backed vultures (Gyps africanus), Masai Mara National Reserve, Kenya.

Silke Arndt / Male Common warthog (Phacochoerus africanus) feeding on a dead Blue wildebeest (Connochaetes taurinus), with White-backed vultures (Gyps africanus), Masai Mara National Reserve, Kenya.

Frederique Olivier / Close-up of a Common warthog (Phacochoerus africanus) feeding, Ngorongoro Crater, Tanzania.

Frederique Olivier / Common warthog (Phacochoerus africanus) feeding, Ngorongoro Crater, Tanzania.

Frederique Olivier / Common warthog (Phacochoerus africanus) feeding, Ngorongoro Crater, Tanzania.

Frederique Olivier / Group of Warthogs (Phacochoerus africanus) grazing, Serengeti NP, Tanzania.

Frederique Olivier / Warthog (Phacochoerus africanus) grazing, Lake Manyara NP, Tanzania.

Denis-Huot / Warthog (Phaecochoerus aethiopicus) male lying in a muddy puddle, Nairobi National Park, Kenya. April.

Juergen & Christine Sohns / Cape Warthog (Phacochoerus aethiopicus), Hluhluwe-Umfolozi Game Reserve, South Africa

Juergen & Christine Sohns / Cape Warthog (Phacochoerus aethiopicus), Hluhluwe-Umfolozi Game Reserve, South Africa

Denis-Huot / Warthog (Phacochoerus africanus) pair mating, Masai Mara Game Reserve, Kenya.

Christophe Courteau / Warthog (Phacochoerus aethiopicus) female with piglets, Okavango Delta, Botswana

Jose B. Ruiz / Molina's hog-nosed skunk (Conepatus chinga) outside lodge, Torres del Paine. Patagonia, Puerto Natales, Chile.

Jose B. Ruiz / Patagonian hog-nosed skunk (Conepatus humboldtii) Torres del Paine. Patagonia, Puerto Natales, Chile.

Juergen & Christine Sohns / Babirusa (Babyrousa babyrussa) male, Singapore Zoo, Singapore

Gabriel Rojo / Humboldt's hog-nosed skunk (Conepatus humboldtii) Torres del Paine, Chile

Gabriel Rojo / Humboldt's hog-nosed skunk (Conepatus humboldtii) Torres del Paine, Chile

Denis-Huot / Warthog (Phaecochoerus aethiopicus), female and young pigets, Masai Mara Game Reserve, Kenya

Nick Hawkins / Stripe hog-nosed skunk (Conepatus semistriatus) camera trap image, Nicoya Peninsula, Costa Rica.

Nick Hawkins / Stripe hog-nosed skunk (Conepatus semistriatus) camera trap image, Nicoya Peninsula, Costa Rica, March 2015.

Graeme Guy/ BIA / African Lion (Panthera leo) carrying female Cape Warthog (Phacochoerus aethiopicus) prey, Masai Mara, Kenya

Andy Rouse / Cheetah (Acinonyx jubatus) with young warthog prey in mouth. Masai Mara, Kenya, Africa. September

Cheryl-Samantha Owen / Common warthog (Phacochoerus africanus) running in the grass with his tail straight up. Grumeti Reserve, Northern Tanzania.

Wim van den Heever / Warthog (Phacochoerus africanus) mother with baby on back sleeping , Masai Mara, Kenya.

Roland Seitre / Common warthog (Phacochoerus africanus) male in river, Senegal.

Roland Seitre / Pygmy hog (Sus salvanius) captive, occurs in Assam. Critically endangered species.

Roland Seitre / Pygmy hog (Sus salvanius) captive, occurs in Assam. Critically endangered species.

Roland Seitre / Common warthog (Phacochoerus africanus) walking in front of men and broken down van, Niokolo Koba, Senegal.

Roland Seitre / Common warthog (Phacochoerus africanus) babies, Djoudj National Park, St Louis du Senegal, Senegal.