Biodiversity values Over 100 species of fish have been recorded from the upper Chari system, while over 120 species are known from the lake itself and the lower reaches of the Chari River. Both the lake and the Chari flood- plains support a rich terrestrial and aquatic fauna. The region is also notable for the Kuri ox, a domesticated breed of Bos taurus longifrons at risk of extinction. Lake Chad is on a major migration route for birds moving between Africa and the Palearctic. At least 70 species of bird make stopovers each year, especially Pintail Anas acuta (about half a million), Garganey Anas querquedula (about 400,000) and Ruff Philomachus pugnax(about 130,000). Although these numbers are much lower than those reported in the 1960s, they are still significant and qualify the lake for inclusion in the Ramsar List of Wetlands of International Importance. Lake Chad has also been identified as a globally significant Important Bird Area (IBA) according to the criteria developed by BirdLife International. Other important wildlife in the basin include sitatunga Tragelaphus spekii, African elephant Loxodonta africana, hippopotamus Hippopotamus amphibius and crocodile Crocodylus sp.