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

Daniel Heuclin / Western hognose snake (Heterodon nasicus) South East Arizona, USA, September 2013.

Pete Oxford / Southern hognose snake (Heterodon simus) Captive, endemic to the Southeastern United States. Vulnerable species.

Pete Oxford / Southern hognose snake (Heterodon simus) Captive, endemic to the Southeastern United States. Vulnerable species.

Nick Garbutt / Male Malagasy Hog-nosed Snake (Leioheterodon madagascariensis) on forest floor with tourist / photographer in the background. Ankarana National Park, northern Madagascar.

Suzi Eszterhas / Hog-nosed Pit Viper (Bothrops nasutus) Northern Costa Rica, Central America

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

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

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

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

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 / Eastern hognose snake (Heterodon platyrhinos) Florida, USA

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

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

Barry Mansell / Eastern hog nosed snake feigning death {Heterodon platyrhinos} Florida, USA.

Barry Mansell / Eastern hog nosed snakes hatching from eggs {Heterodon platyrhinos} Florida, USA.

Pete Oxford / Amazon Hog-nosed Pit Viper (Porthidium hyoprora) coiled on leaf litter on rainforest floor, Pastaza region, Ecuador

Pete Oxford / Amazon Hog-nosed Pit Viper (Porthidium hyoprora) coiled in rainforest, Pastaza region, Ecuador

Heidi & Hans-Juergen Koch / Hog-nosed Snake (Heterodon sp) defensive behavior, rolling on back to display warning colors on underside, native to North America

Heidi & Hans-Juergen Koch / Hog-nosed Snake (Heterodon sp) portrait, coiled in sand, native to North America

Michael & Patricia Fogden / Western Hog-nosed Snake (Heterodon nasicus) defense display, North America

Michael & Patricia Fogden / Hog-nosed Pit Viper (Porthidium nasutus) swallowing a Rain Frog (Eleutherodactylus sp) note use of fangs to manipulate frog into mouth, rainforest, Costa Rica

Michael & Patricia Fogden / Hog-nosed Pit Viper (Porthidium nasutus) swallowing a Rain Frog (Eleutherodactylus sp) note use of fangs to manipulate frog into mouth, rainforest, Costa Rica

Michael & Patricia Fogden / Hog-nosed Pit Viper (Bothrops nasutus) predating Middleamerican Ameiva (Ameiva festiva) lizard note the use of fangs to manipulate prey into snake's mouth, rainforest, Costa Rica

Michael & Patricia Fogden / Hog-nosed Pit Viper (Bothrops nasutus) female giving birth to live young, rainforest Costa Rica

Michael & Patricia Fogden / Hog-nosed Pit Viper (Bothrops nasutus) defensive throat display, rainforest, Costa Rica

Claus Meyer / Black Mussurana (Clelia occipitolutea) snake, eating a Hognose Snake (Philodryas nattereri), Caatinga ecosystem, Brazil

Claus Meyer / Black Mussurana (Clelia occipitolutea) snake, eating a Hognose Snake (Philodryas nattereri), Caatinga ecosystem, Brazil

Heidi & Hans-Juergen Koch / Hog-nosed Snake (Heterodon sp) close-up portrait, digs in the ground to hide as a defensive behavior when threatened, native to North America

Michael & Patricia Fogden / Hog-nosed Pit Viper (Bothrops nasutus) venomous female with her three young on rainforest floor, Costa Rica

Heidi & Hans-Juergen Koch / Hog-nosed Snake (Heterodon sp) hiding in sand, native to North America

Heidi & Hans-Juergen Koch / Hog-nosed Snake (Heterodon sp) in defensive posture, native to North America

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

Pete Oxford / Hog-nosed Snake (Leioheterodon modestus) camouflaged amid leaf litter, Ankarafantsika Special Reserve, Madagascar

Pete Oxford / Amazon Hog-nosed Pit Viper (Porthidium hyoprora) camouflaged on leaf litter in rainforest, Pastaza region, Ecuador

Nick Garbutt / Hog-nosed pit viper (Porthidium nasutum) camouflaged in leaf litter on the rainforest floor, Boca Tapada region, Costa Rica.