Why do some animals have bright colors?

Bright colors in animals are often used as a form of communication, camouflage, or to signal danger. For example, brightly colored animals like poison dart frogs use their vivid hues to warn predators that they are toxic. On the other hand, many species, such as birds and fish, use bright colors to attract mates, signaling their health and genetic fitness. Some animals, such as chameleons, can change their color to blend into their surroundings, helping them avoid predators.