List of data deficient mammals
As of September 2016, the International Union for Conservation of Nature (IUCN) lists 783 data deficient mammalian species. 14% of all evaluated mammalian species are listed as data deficient. The IUCN also lists 30 mammalian subspecies as data deficient. Of the subpopulations of mammals evaluated by the IUCN, four species and/or subpopulations have been assessed as data deficient. This is a complete list of data deficient mammalian species and subspecies evaluated by the IUCN. Species and subspecies which have data deficient subpopulations (or stocks) are indicated. Where possible common names for taxa are given while  links point to the scientific name used by the IUCN. Primates. There are 20 species and 26 subspecies of primate evaluated as data deficient. Gibbons. Subspecies Lemurs. Species Subspecies Old World monkeys. Species Subspecies New World monkeys. Species Subspecies Cetartiodactyls. Cetartiodactyla includes dolphins, whales and even-toed ungulates. There are 61 species, one subspecies, and three subpopulations of cetartiodactyl evaluated as data deficient. Cetaceans. There are 45 species, one subspecies, and three subpopulations of cetacean evaluated as data deficient. Oceanic dolphins. Species Subpopulations Beaked whales. Species Subpopulations Other cetaceans. Species Subspecies Carnivora. Species Subspecies Pilosa. Subpopulations Eulipotyphla. There are 83  species in the order Eulipotyphla evaluated as data deficient. Rodents. There are 380 rodent species evaluated as data deficient. Hystricomorpha. There are 82 species in Hystricomorpha evaluated as data deficient. Myomorpha. There are 245 species in Myomorpha evaluated as data deficient. Sciuromorpha. There are 50 species in Sciuromorpha evaluated as data deficient. Bats. There are 191 species and one subspecies of bat evaluated as data deficient. Microbats. There are 171 species and one subspecies of microbat evaluated as data deficient. Old World leaf-nosed bats. Species Subspecies