Amurfalcon (talk | contribs) (Alternate names and internal links) |
|||
| Line 1: | Line 1: | ||
| − | + | '''Alternative names: (Maori) Parera, Grey Duck''' | |
;[[:Category:Anas|Anas]] superciliosa | ;[[:Category:Anas|Anas]] superciliosa | ||
[[Image:Pacific_Black_Duck.jpg|thumb|550px|right|Photo by julien<br />Location: Castlemaine, Victoria, Australia]] | [[Image:Pacific_Black_Duck.jpg|thumb|550px|right|Photo by julien<br />Location: Castlemaine, Victoria, Australia]] | ||
| Line 9: | Line 9: | ||
==Taxonomy== | ==Taxonomy== | ||
| − | There are three subspecies of Anas superciliosa: rogersi breeds in Indonesia, New Guinea and Australia, pelewensis on the southwest Pacific islands, and superciliosa in New Zealand. The New Zealand subspecies has declined sharply in numbers, at least in its pure form, due to competition from and hybridisation with the introduced | + | There are three subspecies of Anas superciliosa: ''rogersi'' breeds in [[Indonesia]], [[New Guinea]] and [[Australia]], ''pelewensis'' on the southwest Pacific islands, and ''superciliosa'' in [[New Zealand]]. The New Zealand subspecies has declined sharply in numbers, at least in its pure form, due to competition from and hybridisation with the introduced [[Mallard]]. |
==Habitat== | ==Habitat== | ||
Revision as of 18:05, 6 September 2009
Alternative names: (Maori) Parera, Grey Duck
- Anas superciliosa
Identification
Mostly mid-brown in colour, with buff edged feathers. There is a dark brown line through the eye, bordered with cream above and below and a dark brown crown. The upper wing colour is brown, with a bright glossy green patch in the secondary flight feathers. The white underwing is conspicuous in flight. Young Pacific Black Ducks are similar to the adults in plumage.
Distribution
Australia and throughout the Pacific region.
Taxonomy
There are three subspecies of Anas superciliosa: rogersi breeds in Indonesia, New Guinea and Australia, pelewensis on the southwest Pacific islands, and superciliosa in New Zealand. The New Zealand subspecies has declined sharply in numbers, at least in its pure form, due to competition from and hybridisation with the introduced Mallard.
Habitat
All types of water, from isolated forest pools to tidal mudflats.
Behaviour
These birds are seen in pairs or small flocks.
Its diet includes the seeds of aquatic plants, small crustaceans, molluscs and aquatic insects. Food is obtained by 'dabbling', where the bird plunges its head and neck underwater and upends, raising its rear end vertically out of the water. Occasionally, food is sought on land in damp grassy areas.
Courtship is accompanied by ritualised displays including preening, bobbing and wing-flapping. This behaviour is often initiated by the female, and, other than copulation, the male helps little in the breeding process. Often, two broods will be raised in a year. The number of offspring produced may seem quite high, but only 20% of these will survive past two years of age.
