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

David Noton / The Canal du Midi near Castelnaudary, Languedoc-Rousillon, France. September 2011.

David Noton / A jogger on the towpath of the Canal du Midi near Castelnaudary, Languedoc-Rousillon, France. Septeber 2011.