This is an adult East African gaboon viper. Note the very short rostral horns.
Stoked by a moment’s carelessness by a very experienced keeper of hot (=venomous) snakes that resulted in a bite by a Gaboon viper, as well as a number of other widely publicized incidents, the antivenomous lobby has again been awakened.

The bite was a most unfortunate accident for Gaboons are not difficult snakes to work with. In fact, they are among the easiest. A heavy bodied nocturnal ambush predator, Gaboon vipers (aka Gaboon adders) are usually of quiet demeanor during the hours of daylight and although more alert and active at night or when food is offered they are, except for a defensive or feeding strike, neither especially fast nor agile. Their remarkably pretty coloration and patterns render the species (here I am considering both the eastern and the western forms subspecies—Bitis gabonica gabonica and B. g. rhinoceros respectively--- rather than genetically distinct full species). That Gaboons have long fangs and are able to expend a large amount of complex venom is unquestioned. The whys, wherefores, and legalities, of these potentially dangerous snakes being kept by hobbyists perplex non-herpers. Since a Gaboon viper was one of the first exotic snakes that I, as a herper, maintained, this is not a question I dwell long upon. I need only see—or not see, as the case may be—a Gaboon camouflaged against a leafy background and the “whys” answer themselves.