Chien Lee / Ecuadorian Toad-headed Pit-viper (Bothrocophias campbelli) in rainforest, Mashpi Amagusa Reserve, Pichincha, Ecuador

Pete Oxford / Two Striped Forest Pit Viper mother with day old young. Ecuadorian Amazon rainforest.

Pete Oxford / Two Striped Forest Pit Viper, Ecuadorian Amazon, South America

Lucas Bustamante / Ecuadorian toadheaded viper (Bothrops campbelli) portrait, Mindo, Pichincha, Ecuador.

Lucas Bustamante / Ecuadorian toadheaded viper (Bothrops campbelli) curled up, Mindo, Pichincha, Ecuador.

Lucas Bustamante / Andean forest pit viper (Bothriopsis pulchra) curled up on fern, Sumaco, Napo, Ecuador.

Lucas Bustamante / Speckled forest pit viper (Bothriopsis taeniata) on heliconia, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Ecuadorian toadhead (Bothrocophias campbelli) with Mosquito (Culicidae) feeding on its head, Mindo, Pichincha, Ecuador.

Lucas Bustamante / Two striped forest pitviper (Bothriopsis bilineata) curled up on log, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Common lancehead (Bothrops atrox) curled up, Yasuni National Park, Orellana, Ecuador.

Pete Oxford / Arboreal viper (Bothriopsis pulchra) Andes, Ecuador. Captive, occurs in South America.

Pete Oxford / Two Striped forest pit viper (Bothriopis bilineatus) Ecuadorian Amazon, Ecuador, South America