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Poisonous animals are different from venomous animals .
Venomous animals have a toxin that they deliver to predators, using specialized organs, like stingers or hollow fangs. Monarch Butterfly Life Cycle See how a Monarch Butterfly starts out as an egg, hatches into a caterpillar, becomes a pupa, then emerges as a fully-grown adult. Poison Arrow Frog Poison arrow or poison dart frogs are poisonous frogs from rainforests of South and Central America. Some South American Indians apply the poison to the tips of their hunting arrows and blow-gun darts. Pufferfish Also called blowfish and fugu, this poisonous fish can swallow water to double its size.