In September 2016, the International Union for Conservation of Nature (IUCN) listed 783 data deficient mammalian species. Of all evaluated mammalian species, 14% 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
Yunnan lar gibbon
Lemurs
Species
Subspecies
Ranomafana bamboo lemur
Tarsiers
Old World monkeys
Species
Osman Hill's mangabey
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.
Non-cetacean even-toed ungulates
Cetaceans
There are 45 species, one subspecies, and three subpopulations of cetacean evaluated as data deficient.
Oceanic dolphins
Species
Subpopulations
Long-finned pilot whale (1 subpopulation) Risso's dolphin (1 subpopulation)
Beaked whales
Species
Subpopulations
Cuvier's beaked whale (1 subpopulation)
Other cetaceans
Species
Subspecies
Pygmy blue whale
Marsupials
Carnivora
Species
Afrosoricida
Pilosa
Subpopulations
Silky anteater (1 subpopulation)
Eulipotyphla
There are 83 species in the order Eulipotyphla evaluated as data deficient.
Shrews
Erinaceids
Long-eared gymnure
Talpids
Lagomorpha
Rodents
There are 380 rodent species evaluated as data deficient.
Hystricomorpha
There are 82 species in Hystricomorpha evaluated as data deficient.
Tuco-tucos
Chinchilla rats
Dasyproctids
Neotropical spiny rat species
New World porcupines
Other Hystricomorpha species
Myomorpha
There are 245 species in Myomorpha evaluated as data deficient.
Murids
Cricetids
Nesomyids
Spalacids
Dipodids
Mouse-like hamsters
Noble mouse-like hamster
Tsolov's mouse-like hamster
Castorimorpha
Lined pocket mouse
Oaxacan pocket gopher
Sciuromorpha
There are 50 species in Sciuromorpha evaluated as data deficient.
Sciurids
Dormice
Anomaluromorpha
Pel's flying squirrel
Cingulata
Bats
There are 191 species and one subspecies of bat evaluated as data deficient.
Megabats
Microbats
There are 171 species and one subspecies of microbat evaluated as data deficient.