____ is the simplest way to ____ themselves for many animals, fish and birds. ____ animals that are faster than their predators have a good chance of ____.Some animals have ____ that make them very difficult to eat. Porcupine's ____ are very hard and can ____ the predator. Other animals produce chemicals from their body. The dart frog, for example, has got ____ in its skin. The bright colours tell the prdators "I'm ____. You must not eat me."

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