This is a series of photographs from University of Pennsylvania biology professor Daniel Janzen of a species of caterpillar in Costa Rica (and other Central American countries) that has a realistic looking snake's head on its underside. Plus it will actually try to strike like a snake if you get too close. I don't know about you, but that would trick me if I were a predator. I'm going to eat you! Oh shit, no I'm not! Sorry Mr. Snake, I was just, uh, I was just reaching for these berries. Yeah, I was just going to eat these berries. "Those are poisonous." *swallowing handful* Finally.
Keep going for a couple more shots of the please do not back that ass up.
Thanks to Dio, who once bit the head off a viper because it was either him or the snake.