Many animals prey on butterflies and caterpillars. However these activities do not cause the extinction of butterfly species. There are different forms of mimicry by which butterflies are able to protect themselves from predators. Butterflies are sometimes protected by toxines they have consumed in the caterpillar stage. With their colours butterflies warn predators not to eat them. Some non-poisonous species imitate the colours of poisonous species to confuse predators.