New species are still being discovered in the Ozarks of Arkansas, Oklahoma, and Missouri. The ecology of the community of life forms living in subterranean habitats is also poorly known and being studied on an intensified basis. Bioinventory work includes carefully examining all passageways accessible to humans for life forms and documenting everything that is encountered. Often times, cave animals are small. This means that all habitats in a cave, including smaller cracks and crevices, need to be examined with care. Further, any decomposing organic materials (leaves, scat, dead bodies, etc.) need to be searched because these are the nutrient resources to which life forms in caves are attracted. Often, subterranean waterways are the only way into and out of cave systems. Cave streams, pools, and lakes need to be carefully examined for aquatic life. This is an image of a bioinventory exercise in an Ozark cave in Northeastern Oklahoma. Biologists who study subterranean ecology and life forms are referred to as biospeleologists.