This is a gorgeous little Eyelash pit viper that I found on my recent trip to Costa Rica. In this shot you can clearly see one of its heat sensitive pits between the eye and nose. These pits give the viper a sixth sense which it uses to detect warm-blooded prey. A snake like this can deliver a potentially lethal dose of venom through its large, hypodermic needle-like fangs that are kept folded back against the roof of its mouth. Needless to say, when taking this shot I was careful not to let my warm-blooded fingers get within striking range!