Bizarre Caterpillar With Erupting Tentacles

Deep in the Peruvian Amazon, an odd-looking caterpillar is doing its best to look like just another rain forest twig. But its four long tentacles are coiled, ready to respond to the first sign of danger.
 Suddenly, a group of people approaches.
 Sensing vibrations from the group's voices, the caterpillar unleashes its defenses.