Like its flora, Madagascar's fauna is diverse and exhibits a high rate of endemism. Lemurs have been characterized as "Madagascar's flagship mammal species" by Conservation International. In the absence of monkeys and other competitors, these primates have adapted to a wide range of habitats and diversified into numerous species. , there were officially 103 species and subspecies of lemur, 39 of which were described by zoologists between 2000 and 2008. They are almost all classified as rare, vulnerable, or endangered. At least 17 species of lemur have become extinct since humans arrived on Madagascar, all of which were larger than the surviving lemur species.