List of mammals of Heard Island and McDonald Islands
# List of mammals of Heard Island and McDonald Islands

This is a list of the mammal species recorded in Heard Island and McDonald Islands. There are 13 mammal species in Heard Island and McDonald Islands, of which none are thought to be at risk.

The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature:

| EX | Extinct | No reasonable doubt that the last individual has died. |
| - | - | - |
| EW | Extinct in the wild | Known only to survive in captivity or as a naturalized populations well outside its previous range. |
| CR | Critically endangered | The species is in imminent risk of extinction in the wild. |
| EN | Endangered | The species is facing an extremely high risk of extinction in the wild. |
| VU | Vulnerable | The species is facing a high risk of extinction in the wild. |
| NT | Near threatened | The species does not meet any of the criteria that would categorise it as risking extinction but it is likely to do so in the future. |
| LC | Least concern | There are no current identifiable risks to the species. |
| DD | Data deficient | There is inadequate information to make an assessment of the risks to this species. |

## Order: Cetacea (whales)

The order Cetacea includes whales, dolphins and porpoises. They are the mammals most fully adapted to aquatic life with a spindle-shaped nearly hairless body, protected by a thick layer of blubber, and forelimbs and tail modified to provide propulsion underwater.

* Suborder: Odontoceti
   * Superfamily: Platanistoidea
      * Family: Phocoenidae
         * Genus: Phocoena
            * Spectacled porpoise, Phocoena dioptrica DD
      * Family: Ziphidae
         * Genus: Berardius
            * Giant beaked whale, Berardius arnuxii LR/cd
         * Subfamily: Hyperoodontinae
            * Genus: Mesoplodon
               * Gray's beaked whale, Mesoplodon grayi DD
               * Layard's beaked whale, Mesoplodon layardii DD
      * Family: Delphinidae (marine dolphins)
         * Genus: Orcinus
            * Orca, Orcinus orca LR/cd
         * Genus: Globicephala
            * Pilot whale, Globicephala melas LR/lc

## Order: Carnivora (carnivorans)

There are over 260 species of carnivorans, the majority of which feed primarily on meat. They have a characteristic skull shape and dentition.

* Suborder: Caniformia
   * Family: Otariidae (eared seals, sealions)
      * Genus: Arctophoca
         * Antarctic fur seal, Arctophoca gazella LR/lc
         * Subantarctic fur seal, Arctophoca tropicalis LR/lc
   * Family: Phocidae (earless seals)
      * Genus: Hydrurga
         * Leopard seal, H. leptonyx LC
      * Genus: Leptonychotes
         * Weddell seal, Leptonychotes weddellii LR/lc
      * Genus: Lobodon
         * Crabeater seal, Lobodon carcinophagus LR/lc
      * Genus: Mirounga
         * Southern elephant seal, Mirounga leonina LR/lc
      * Genus: Ommatophoca
         * Ross seal, Ommatophoca rossii LR/lc
