Atheris is a genus of venomous vipers found only in tropical subsaharan Africa, excluding southern Africa. Confined to rain forest areas, many members have isolated and fragmented distributions<---- it looks like a dragon!
This is the "happy face" of the Gaboon Viper (notice the sheathed fangs). Once those fangs are unsheathed, the Gaboon Viper is deadly venomous. It has a fierce arrow- shaped head and a striking pattern on its back!