This snake, a wiper, guarded the entrance to one of the caves. We visitied the cave three times, and each time we had to move the snake. Caving Expedition Khammouane 2013 (K13) to Khammouane, Laos (www.explo-laos.com/Expeditions/2013.html).
Determined by Alexandre Teynié (2013-04-09) to a young individual of trhee horned-scaled pitviper (Triceratolepidophis sieversorum, sometimes Protobothrops sieversorum), a rather recently (2000) described species of venomous pit vipers (Crotalinae). The pit vipers have heat sensing organs, and this species is hunting bats (and possibly other similar-sized animals) in cave entrances.
One of the six or so snakes that I encountered during the three weeks. This one was in a dry rice field. Caving Expedition Khammouane 2013 (K13) to Khammouane, Laos (www.explo-laos.com/Expeditions/2013.html).
Dixonius siamensis (Boulenger, 1898)
Chrysopelea ornata (Shaw, 1802)
Common name: Ornate flying snake, Golden tree snake
Lycodon subcinctus Boie, 1827
Draco maculatus (Gray, 1845)
Ovophis monticola (Günther, 1864)
Enhydris subtaeniata (Bourret, 1934)
Coelognathus radiatus (Boie, 1827)
Tropidophorus microlepis Günther, 1861
Sphenomorphus maculatus (Blyth, 1853)
Calotes versicolor (Daudin, 1802)