Certain species of butterflies, such as the Monarch butterfly, sequester toxins from their host plants, making them unpalatable or poisonous to predators. Many species of fish, particularly marine fish like pufferfish and certain reef fish, produce potent toxins such as tetrodotoxin or ciguatoxin. Similarly, numerous species of amphibians, including many frogs, possess toxic secretions in their skin glands, used as a defense mechanism against predation.