Fauna is all of the animal life of any particular region or time. The corresponding term for plants is flora.
Zoologists and paleontologists use fauna to refer to a typical collection of animals found in a specific time or place, e.g. the "Sonoran Desert fauna" or the "Burgess shale fauna".
Paleontologists sometimes refer to a sequence of faunal stages, which is a series of rocks all containing similar fossils.
