Because of its high landscape diversity and low latitude, Georgia is home to about 5,601 species of animals, including 648 species of vertebrates (more than 1% of the species found worldwide) and many of these species are endemics. A number of large carnivores live in the forests, namely Brown bears, wolves, lynxes and Caucasian Leopards. The common pheasant (also known as the Colchian Pheasant) is an endemic bird of Georgia which has been widely introduced throughout the rest of the world as an important game bird. The species number of invertebrates is considered to be very high but data is distributed across a high number of publications. The spider checklist of Georgia, for example, includes 501 species. The Rioni River may contain a breeding population of the critically endangered bastard sturgeon.