For example, crayfish may occupy the same strata, preferring the floor, but depending on species they may inhabit either the entrance or dark zone of the cave. There are three terms commonly used to delineate the degree to which a species is dependent on a particular zone within a subterranean habitat, wet or dry. Troglobites, from the Greek troglos meaning cave and bios meaning life, are animals found exclusively in caves and are so adapted that they are unable to exist outside of the dark zone. A list of these types of animals would include the blind cave fishes and some crayfish. It is believed that all troglobites have evolved from troglophiles.
Earthworms are a good example, as are select species of salamanders and crustaceans.
Trogloxenes , from troglos and xenos, meaning guest, are animals often encountered in caves but never complete their whole life cycle underground. Examples of such would include bats, catfishes, eels, and even marine species such as corals, sponges, and lobsters. The unconfined aquifers of the WKP, possess some of the largest and deepest caves in the world. Finally, any determination of species range within the WKP is speculative at best. These observations lend themselves to a limited understanding of the relationships between the faunas and their extended ranges.