- Butterflies: Some butterfly species, like the Monarch butterfly, are poisonous due to toxins accumulated from their host plants (e.g., milkweed). These toxins make them unpalatable to predators. - Fish: Many fish species are poisonous if eaten (e.g., pufferfish containing tetrodotoxin). Additionally, many fish are venomous, possessing spines or barbs that deliver toxins (e.g., stonefish, lionfish, stingrays). - Frogs: Numerous frog species, particularly brightly colored ones in tropical regions (like poison dart frogs), secrete potent toxins through their skin as a defense mechanism. These toxins can be extremely dangerous or even lethal to predators.