The term refers to printable or digital outlines of creatures that inhabit subterranean environments, intended for coloring. These illustrations often depict animals adapted to life in caves, such as bats, cavefish, and various invertebrates. As an example, a sheet might feature a blank outline of a blind cave salamander in its natural habitat, ready to be colored with crayons or markers.
Such resources provide an engaging and educational activity. They can be used to introduce individuals, especially children, to the biodiversity found in unique ecosystems and to stimulate interest in biology and conservation. Historically, depictions of these creatures have been used in educational materials to raise awareness of often-overlooked species and their ecological roles.
