List of data deficient mammals

Mammalian species (IUCN, 2025.2)
  • 6,036 extant species have been evaluated
  • 5,247 of those are fully assessed
  • 3,792 are not threatened at present
  • 1,455 to 2,244 are threatened
  • 91 to 121 are extinct or extinct in the wild:
    • 90 extinct (EX) species
    • 1 extinct in the wild (EW)
    • 30 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]

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.

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