Predators is a 2010 American science fiction action film directed by Nimród Antal and starring Adrien Brody, Laurence Fishburne, Topher Grace, Alice Braga, Walton Goggins, Danny Trejo, Mahershalalhashbaz Ali, Oleg Taktarov and Louis Ozawa Changchien. It was distributed by 20th Century Fox. It is the fifth film in the Predator franchise, following Predator (1987), Predator 2 (1990), and the crossover films Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007).
The monarch is toxic, the viceroy is non-toxic. Predators cannot tell the difference between the two and therefore avoid both. http://networkofideas.wordpress.com/2010/11/01/the-monarch-butterfly-vs-the-viceroy/
Spicebush Swallowtail Caterpillar - When the larvae are nearly ready to pupate, they turn a yellow-green color marked by two large black dots with a white highlight. The placement of these dots creates the illusion that the caterpillars are common green snakes which help the caterpillars to ward off predators, specifically birds. (image credit Jay Cossey)