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

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

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

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

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

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

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