Madre Selva field station, Depto Loreto, Peru. January 11, 2011.
The Madre Selva field station is situated on the banks of the Rio Orosa, and as such is blessed with a full complement of riparian species, including three species of Helicops keelbacks. H. angulatus are common around the field station, and can be found day or night. And of course, they bite as freely and vigorously as any North American water snake.
Peru 2011 Flickr album is here.
HerpMapper records for this species are here.