Why do some animals have poisonous skin?

Some animals have poisonous skin as a defense mechanism to deter predators. Brightly colored amphibians, such as poison dart frogs, have skin that secretes toxins, making them unpalatable or dangerous for potential predators. These toxins can cause severe irritation, paralysis, or even death. The brightly colored skin serves as a warning signal, a concept known as aposematism, indicating to predators that the animal is toxic and should be avoided. This adaptation helps protect the animals from being eaten.