Pit vipers, along with several of their snake cousins, marry two senses to better locate prey at night: sight and a heat-detecting ability. Deep pits, which lie on each side of the snake's face ...

A striking photo captures the moment a venomous green pit viper devours a brown tree frog in a rainforest in Taiwan, as the frog forlornly takes a final gulp of air. The gruesome shot has been ...