Cave Underground Space

• Sistema Sac Actun, Mexico
Ecology
Cave-inhabiting animals are often categorized as troglobites (cave-limited species), troglophiles (species that can live their entire lives in caves, but also occur in other environments), trogloxenes (species that use caves, but cannot complete their life cycle wholly in caves) and accidentals (animals not in one of the previous categories). Some authors use separate terminology for aquatic forms (for example,, stygobites, stygophiles, and stygoxenes).