Jiri Lochman / Brown tree snake (Boiga irregularis), Wallamans Falls, Girringun National Park, Wet Tropics of Queensland UNESCO Natural World Heritage Site, Queensland, Australia.

Chien Lee / Brown Tree Snake (Boiga irregularis) juvenile, Mamberamo Basin, Dabra, Indonesia

Chien Lee / Brown Tree Snake (Boiga irregularis), Weda Bay, Halmahera, Sulawesi, Indonesia

Chien Lee / Brown Tree Snake (Boiga irregularis), Halmahera Island, North Maluku, Indonesia

Michael & Patricia Fogden / Brown Tree Snake (Boiga irregularis) sensing with tongue in the rainforest, introduced pest, Kuranda State Forest, Australia

Michael & Patricia Fogden / Brown Tree Snake (Boiga irregularis) in defensive display, sensing with tongue in the rainforest, Kuranda State Forest, Australia

Gerry Ellis / Brown Tree Snake (Boiga irregularis), native to tropical Australia but introduced to Guam where it has decimated native bird populations

Gerry Ellis / Brown Tree Snake (Boiga irregularis) species has been introduced to Guam and has become a pest, Northern Territory, Australia

Mark Moffett / Indian Gamma Snake (Boiga trigonata ) close up of head and scales, Kerman Dunes, Iran

Bruce Thomson / Brown tree snake (Boiga irregularis) portrait, Cooktown, Queensland, Australia.

Bruce Thomson / Brown tree snake (Boiga irregularis) hanging from tree branch, Cooktown, Queensland, Australia

Bruce Thomson / Brown tree snake (Boiga irregularis) coiled around tree branches, Katherine, Northern Territory, Australia.