Daniel Heuclin / Wagler's pit viper (Tropidolaemus wagleri) male, Gunung Leuser. Sumatra.

Daniel Heuclin / Wagler's pit viper (Tropidolaemus wagleri) male, Sumatra.

Daniel Heuclin / Wagler's pit viper (Tropidolaemus wagleri) male, Sumatra.

Daniel Heuclin / Wagler's pit viper (Tropidolaemus wagleri) male, Sumatra.

Nick Garbutt / Wagler's pit viper (Tropidolaemus wagleri) in riverine forest understorey. Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Wagler's pit viper (Tropidolaemus wagleri) in riverine forest understory. Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Wagler's pit viper (Tropidolaemus wagleri) basking in mist-shrouded forest under storey. Danum Valley, Sabah, Borneo.

Adrian Davies / Wagler's pit viper (Tropidolaemus wagleri) on branch, Sabah, Borneo

Adrian Davies / Wagler's pit viper (Tropidolaemus wagleri) on branch, Sabah, Borneo

Adrian Davies / Wagler's pit viper (Tropidolaemus wagleri) withdrawing tongue, Sabah, Borneo

Michael D. Kern / Kaleidoscope pattern formed from picture of Wagler's Temple Viper (Tropidolaemus wagleri) scales. See original image number 01173495.

Chris Mattison / Wagler's Pit Viper (Tropidolaemus wagleri) Bako National Park, Sarawak, Borneo