Daniel Heuclin / Pope's pitviper (Trimeresurus / Popeia popeorum)captive, from SE Asia

Nick Garbutt / Pope's pit / tree viper (Trimeresurus popeorum) in lowland forest. Danum Valley, Sabah, Borneo, Malaysia

Robert Thompson / Pope's pit viper (Trimeresurus popeorum) native to northern India, Southeast Asia, and parts of Indonesia.

Robert Thompson / Pope's pit viper (Trimeresurus popeorum) native to northern India, Southeast Asia, and parts of Indonesia.

David Tipling / Marsh harrier (Circus aeruginosus) flying over Watling Water, Pope's Marsh Salthouse, Norfolk, UK, November

Pete Oxford / Pope's nose cactus (Proboscides jussieui) Rupununi savanna, Guyana, South America

Michael D. Kern / Kaleidoscope pattern formed from picture of Popes Tree Viper (Trimeresurus popeorum) scales.

David Tipling / Restoration work on shooting pools, Pope's Marsh, Cley Norfolk Wildlife Trust Reserve, Norfolk, UK, March 2014.

David Tipling / Restoration work on shooting pools, Pope's Marsh, Cley Norfolk Wildlife Trust Reserve, Norfolk, UK, March 2014.

David Tipling / Restoration work on shooting pools, Pope's Marsh, Cley Norfolk Wildlife Trust Reserve, Norfolk, UK, March 2014.

Ben Cranke / Red-cowled Cardinal (Paroaria dominicana) perched on a tree branch, Piaui, Brazil. August.

Ben Cranke / Red-cowled Cardinal (Paroaria dominicana) perched on a tree branch, Piaui, Brazil. July.