looks like a black mamba Snake (previous pinner) Black Mamba snakes are in fact not black. But they are named after the insides of their mouths which are black. In reality they are a green-ish grey colour.
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!