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

Ernie Janes / Western Hog-nosed Snake (Heterodon nasicus) captive species from North America and Mexico

Jabruson / Ivory carvings on sale at market vendor in Banghi, Central African Republic. Aimed at tourists and religious missionaries, the ivory comes from African Forest Elephant (Loxodonta africana cyclotis) a...

ZSSD / Babirusa (Babyrousa babyrussa) juveniles play fighting, native to Indonesia

ZSSD / Babirusa (Babyrousa babyrussa) juvenile, native to Indonesia

ZSSD / Red River Hog (Potamochoerus porcus) pair, native to Africa

Michael D. Kern / Hognosed Pit Viper (Porthidium nasutum) captive, from Central and South America and Caribbean

Michael D. Kern / Lansbergi's hognosed pitviper (Porthidium lansbergii lansbergii) captive, from central and south America

MYN / Brady Beck / Eastern hognose snake (Heterodon platirhinos) coiled, Scotland County, North Carolina, USA, May, meetyourneighboursproject.net

Daniel Heuclin / Western Hognose Snake (Heterodon nasicus) tasting air with its tongue. Endemic to western North America and Mexico.

Daniel Heuclin / Western Hognose Snake (Heterodon nasicus), studio shot against white background. Endemic to western North America and Mexico.

MYN / Paul Marcellini / Hog fish (Lachnolaimus maximus) juvenile, Biscayne National Park, Florida, USA, April. meetyourneighbours.net project

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

Edwin Giesbers / Red river hog (Potamochoerus porcus) profile portrait, captive

Edwin Giesbers / Red river hogs (Potamochoerus porcus) foraging in mud, captive

Edwin Giesbers / Red river hog (Potamochoerus porcus) 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.

Sandesh Kadur / Snout of a 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.

Suzi Eszterhas / Hog deer (Axis porcinus) Kaziranga National Park, India

Ernie Janes / Hog deer (Cervus porcinus) buck bellowing, UK, captive

Ernie Janes / Hog deer (Cervus porcinus) buck, UK, captive

Ernie Janes / Hog deer (Ccervus porcinus) female, UK, captive

Daniel Heuclin / Calamian deer (Axis calamaniensis) wild, Calauit Island, Calamian Islands, Philippines, Endemic and endangered

Bernard Castelein / Portrait of a Hog Deer (Cervus / Axis / Hyelaphus porcinus). Assam, India, February.

Bernard Castelein / Hog Deer (Cervus / Axis / Hyelaphus porcinus), eating the flower of a Cotton Silk Tree (Bombax ceiba). Kaziranga National Park, Assam, India, February.

Bernard Castelein / Hog Deer (Cervus / Axis / Hyelaphus porcinus) in profile. Kaziranga National Park, Assam, India, February.

Bernard Castelein / Hog Deer (Cervus / Axis / Hyelaphus porcinus) juvenile. Kaziranga National Park, India, February.

Pete Oxford / Southern Hognose Snake (Heterodon simus), native to the southeastern United States

Tui De Roy / Cape Warthog (Phacochoerus aethiopicus) parent and piglets, Ol Pejeta Conservancy, Kenya

Barry Mansell / Western Hog-nosed Snake (Heterodon nasicus) lying in sand, Arizona, USA

Suzi Eszterhas / Hog Deer (Axis porcinus) male, Kaziranga National Park, India

Suzi Eszterhas / Hog Deer (Axis porcinus) female, Kaziranga National Park, India, digitally manipulated

Suzi Eszterhas / Hog Deer (Axis porcinus) males, Kaziranga National Park, India

Mark Bowler / Kuhl's / Bawean hog deer (Axis kuhlii) native to Bawean Island, Indonesia. Captive. Edinburgh Zoo, Critically Endangered

Mark Bowler / Kuhl's / Bawean hog deer (Axis kuhlii) native to Bawean Island, Indonesia. Captive. Edinburgh Zoo, Critically Endangered

Mark Bowler / Kuhl's / Bawean hog deer (Axis kuhlii) native to Bawean Island, Indonesia. Captive. Edinburgh Zoo, Critically Endangered

Michael D. Kern / Western hognose snake (Heterodon nasicus nasicus) albino, captive, from USA

Michael D. Kern / Lansbergi pitviper (Porthidium lansbergii rozei) captive, from Central and South America

Alex Hyde / Hog roast on table, with another roasting on spit. Oxfordshire, UK.

Claudio Contreras / Rainforest hognose pitviper (Porthidium nasutum) Montes Azules Biosphere Reserve, Lacandon Rainforest, Mexico, September

Claudio Contreras / Rainforest hognose pitviper (Porthidium nasutum) Montes Azules Biosphere Reserve, Lacandon Rainforest, Mexico, September

Bernard Castelein / Hog Deer (Axis / Cervus porcinus), Kaziranga NP, Assam, India, Endangered species

Pete Oxford / Hog deer {Axis porcinus} herd in Kaziranga National Park, Assam, NE India, Endangered

Jabruson / Bush pigs {Potamochoerus porcus} searching mangoire for nuts, Maya Nord Bai, Odzala NP, Congo

Richard Du Toit / Cape Warthog (Phacochoerus aethiopicus) female with four piglets, Sabi Sands Game Reserve, South Africa

ZSSD / Red River Hog (Potamochoerus porcus) piglet climbing on resting adult, native to Africa

Nick Garbutt / Hog badger (Arctonyx collaris) from rainforests in mainland SE Asia (including Bhutan, China, Vietnam, Laos, Thailand, Cambodia, and Sumatra) Captive, Singapore Zoo.

Bruno D'Amicis / Bush pig / Red Riverine hog (Potamocherus larvatus) running, Kaffa zone, Southern Ethiopia, East Africa December 2008

ZSSD / Red River Hog (Potamochoerus porcus) piglet running, native to Africa

ZSSD / Red River Hog (Potamochoerus porcus) three piglets, native to Africa

Thomas Marent / Babirusa (Babyrousa babyrussa) showing typical curves tusks, Sulawesi

Nick Garbutt / Red River Hogs (Potamochoerus porcus) wallowing at Langoue Bai, Ivindo National Park, Gabon, Central Africa.

Suzi Eszterhas / Cape Warthog (Phacochoerus aethiopicus) walking, Lewa Wildlife Conservancy, Kenya

Suzi Eszterhas / Cape Warthog (Phacochoerus aethiopicus), Lewa Wildlife Conservancy, Kenya

ZSSD / Red River Hog (Potamochoerus porcus) piglet trio, a highly social bush pig native to Africa, San Diego Zoo, California

Shattil & Rozinski / Western hognose snake {Heterodon nasicus} feigning death to avoid predation, Colorado, USA

Shattil & Rozinski / Western hognose snake {Heterodon nasicus} Colorado, USA

Tim Laman / Calamian Deer (Axis calamianensis) wild, Dimakya Island, Calamian Islands, Palawan, Philippines, Endangered

Michael D. Kern / Tri-colour hognose snake {Lystrophis pulcher} captive, from South America

Michael D. Kern / Western hognose snake {Heterodon nasicus} upside down with mouth open feigning death, captive, from western USA

Michael D. Kern / Western hognose snake {Heterodon nasicus} captive, from western USA

Michael D. Kern / Western hognose snake {Heterodon nasicus} captive, from western USA

Barry Mansell / Western Hog Nose Snake (Heterodon nasicus) on ground, Arizona, USA

Suzi Eszterhas / Burchell's Zebra (Equus burchellii), Cape Warthog (Phacochoerus aethiopicus) and Common Eland (Tragelaphus oryx), Masai Mara, Kenya

Suzi Eszterhas / Cape Warthog (Phacochoerus aethiopicus) mother and very young piglets nursing, Masai Mara, Kenya

Suzi Eszterhas / Cape Warthog (Phacochoerus aethiopicus) mother and very young piglets, Masai Mara, Kenya

Theo Allofs / Hog Deer (Axis porcinus) near elephant grass, India

Hanne & Jens Eriksen / Hog nosed skunk {Conepates humboldtii} Seno Otway, Chile

Philippe Clement / Western hognose snake (Heterodon nasicus) portrait. Arizona, USA. Captive.

ZSSD / Red River Hog (Potamochoerus porcus) pair of piglets, highly social bush pig native to Africa and Madagascar

ZSSD / Red River Hog (Potamochoerus porcus) three piglets, native to Africa

ZSSD / Red River Hog (Potamochoerus porcus) piglets running, native to Africa

Richard Du Toit / Cape Warthog (Phacochoerus aethiopicus), Itala Game Reserve, South Africa

Konrad Wothe / Domestic Pig (Sus scrofa domesticus) in puddle with muddy snout, Germany

Barry Mansell / Eastern hognose snake (Heterodon platyrhinos) Florida, USA

Barry Mansell / Eastern hog nosed snake feigning death (Heterodon platyrhinos) Florida, USA

Barry Mansell / Western hognose snake (Heterodon nasicus) Arizona, USA

Richard Du Toit / Cape Warthog (Phacochoerus aethiopicus) portrait, Eastern Cape, South Africa

ZSSD / Babirusa (Babyrousa babyrussa) showing typical curved tusks, native to Indonesia

Pete Oxford / Amazonian hog nose pit viper {Porthidium hyoprora} Amazonia, Ecuador

Pete Oxford / Amazonian hog nose pit viper {Porthidium hyoprora} beside rainforest seedling, Amazonia, Ecuador

Pete Oxford / Amazonian hog nose pit viper {Porthidium hyoprora} Amazonia, Ecuador

Rod Williams / Red river hog {Potamochoerus porcus} juvenile female, captive from West and Central Africa