Since most higher animals have relatively good eyesight, they use it to find what they want. Both herbivores (animals which eat plants), and predators (animals which hunt and eat other animals), use sight to find their food. Prey need to avoid being eaten by predators. Their best chance is to avoid being seen. Usually, they need camouflage. With camouflage, an animal looks like its background, and so is more difficult to see. This is achieved in various ways: 