Harteman Wildfowl, presented by Jan Harteman

Radjah shelduck (Burdekin duck)

Tadorna radjah

Radjah bergeend / Radjahgans / Tadorne radjah

 

Radjah shelducks are native to Australia, Indonesia and Papua New Guinea. They were introduced to Singapore and vagrant to Timor-Leste.

The species prefers the brackish waters of mangrove flats and paperbark tree swamps, but will visit freshwater swamps, lagoons, and billabongs further inland during the wet season. The diet consists mainly of mollusks, insects, sedge materials and algae. Pairs start searching for nesting sites during the months of January and February. They nest close to their primary food source, often in the hollow limbs of trees, which makes habitat destruction a particular issue.

 

This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern (IUCN, 2012).


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Above: adult Radjah shelduck


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Above: adult Radjah shelduck


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Above: adult Radjah shelduck


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Above: adult Radjah shelduck, Burgers' Zoo, the Netherlands

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