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| Subspecies: | Unknown |
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| Est. World Population: | |
| CITES Status: | NOT LISTED |
| IUCN Status: | Extinct |
| U.S. ESA Status: | NOT LISTED |
| Body Length: | |
| Tail Length: | |
| Shoulder Height: | |
| Weight: | |
| Top Speed: | |
| Jumping Ability: | (Horizontal) |
| Life Span: | in the Wild |
| Life Span: | in Captivity |
| Sexual Maturity: | (Females) |
| Sexual Maturity: | (Males) |
| Litter Size: | |
| Gestation Period: | |
Habitat:
It was largely a freshwater species, foraging in inland streams, estuaries and, occasionally, sheltered bays (Kear and Scarlett 1970).
Range:
Mergus australis was restricted to the Auckland Islands, New Zealand, by the time of its discovery in 1840 (Stattersfield et al. 1998), but subfossil remains of a Mergus species have also been found on South and Stewart Islands. At least 26 specimens were collected in total, the last in 1902 (Kear and Scarlett 1970); there have been no records since, despite intensive searches (Williams and Weller 1974).