Unlike the surface environment that is very changeable, cave environments are constant. It is a world of total darkness, constant temperature and high humidity. The animals that live in caves must not only adapt to these conditions, they must live in an environment where there is very little to eat.The population of animals living in caves is very small compared to the animal life on the surface. Consequently, a number of cave animals are on the endangered species list. This means that they are in danger of becoming extinct.
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