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!
Eyelash Viper (Bothriechis schlegelii) is a venomous pit viper species found in Central and South America. Small and arboreal, these snakes are characterized by their wide array of color variations, as well as the superciliary scales over the eyes.