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Another way of dealing with enemies is either to have a very good protection or to be able to escape quickly. Many animals can run extremely fast, like the deer. There is another useful trick that some animals use. They can grow new parts of themselves. The starfish, for example, is not very good at escaping or defending itself, but it can grow another foot if it loses one. Sometimes a lizard, if it is in danger, will drop its tail and run away while its enemy is still looking at the twisting tail. Of course, not all species of animals that are alive today have adapted themselves equally well to their surroundings. Several species may become extinct if we do not do something about them.