Bothrocophias hyoprora, or the Amazonian toad-headed pitviper, is a species of venomous snake in the family Viperidae.McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Herpetologists' League. 511 pp. (series). (volume). It is endemic to north-western South America.
Geographic range It is found in Bolivia, Brazil (in the states of Acre, Amazonas, Pará, and Rondônia), Colombia, Ecuador, and Peru.
References
Further reading Amaral, A.P. 1935. Estudos sobre ophídios neotropicos XXXIII. Novas especies de ophídios da Colombia. Memórias do Instituto Butantan 9 : 219-223 + 1 Plate.