Poisonous animals ____ their toxins in different ways. Animals such as snakes use toxins to attack their prey. They ____ their venom into other creatures by biting them. Poisonous frogs, on the other hand, ____ toxins through their skin. This ____ them from predators. One well-known species is the poison dart frog. Found in the rain forests of Colombia, it is coated in poison. A single frog—just two inches (five centimeters) long— ____ enough poison on its skin to kill 10 adult humans. However, not all animal toxins are deadly. Centipedes, for example, produce a venom that is painful to humans but doesn't normally kill.

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