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[[Mount Nimba Strict Nature Reserve]] is a 69 square mile national park straddling the borders of [[Côte d'Ivoire]] and [[Guinea]]; the region also extends into [[Liberia]], but this section is unprotected and heavily exploited for [[mineral]]s and wildlife. Including semi-[[deciduous]] forest, [[rain forest]] and [[savannahsavanna]], it is called a "strict" reserve as, unlike many other national parks, [[tourism]] is forbidden. It has an extremely rich [[endemic]] flora and fauna, and more than 500 new species of fauna have been discovered, including over 200 endemic species. Of special interest is the endangered [[Vivipary|viviparous]] [[toad]] (''Nimbaphrynoides occidentalis''), which occurs only in the upper [[montane]] habitats of Mt. Nimba.<ref>''IUCN Technical Review'' World Heritage Nomination 155 (1981)</ref> Important species of [[mammal]]s include the [[leopard]], the dwarf African otter shrew, which was first discovered in 1954 on Mt. Nimba, and a population of [[chimpanzee|chimpanzees]] whose behaviour behavior involves the use of stone tools.<ref>'''Matsuzawa, T.''' ''et al.'' "Emergence of Culture in Wild Chimpanzees: Education by Master-Apprenticeship" (2001) [http://www.pri.kyoto-u.ac.jp/koudou-shinkei/shikou/reference/book_Priori/Priori.html Primate Research Institute, Kyoto University]. Accessed 16 January 2008</ref> The actual mountain has the highest grade [[iron]] deposits in the world, being almost solid iron [[ore]]. Mining on Mount Nimba accounts for approximately 1 per cent of world production, currently set at around 900 million tons.