Why do some animals have bright markings?

Bright markings in animals often serve as a warning to predators, a form of camouflage, or a signal for mating. For example, animals like poison dart frogs use bright, vivid colors to signal their toxicity, warning potential predators that they are poisonous. On the other hand, some species, like the monarch butterfly, use bright markings to mimic other toxic species and avoid predation. Bright colors can also be used in mating displays, with males displaying vivid markings to attract females.