Decent read for having something to spark the memories of being in Cockscomb basin seeing my first Jaguar in the wild, as well as photographing Fer-de-lance like the one mentioned in the article . . . as far as the evolution of heat pits goes it's an interesting thought, but I think it diverges from the original evolution thought process in viperidae when we examine the evolution of Venom and begs to bring the question in my mind, what evolved first the venom or the pits