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

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

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

Chien Lee / Rainforest Hognose Viper (Porthidium nasutum), Esmeraldas, Ecuador

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

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

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

Murray Cooper / Rainforest Hognose Viper (Porthidium nasutum) coiled on tree trunk, Ecuador

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

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