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Show us your Ducks!

The NZ Whio, or Blue Duck
This duck is a threatened, uniquely NZ species of fowl that inhabits fast-flowing rivers and streams throughout NZ. Nesting females are especially vulnerable to mammalian predators, particularly stoats and possums, while rats and weka have been implicated in nest and egg destructions. Populations are patchy and isolated. They have low reproductive success, and there are more males than females. A five yearly census in 2021 counted 863 pairs. This was an increase of 305 pairs since the 2016 census and 565 more pairs since 2011. Surveys in 2020 found 491 pairs in the North Island, and 372 in the South Island.
  • Whio are believed to be an ancient species of waterfowl. Their isolation in New Zealand has resulted in unique anatomical and behavioural features.
  • A river specialist, and one of the few waterfowl worldwide that live year-round on fast-flowing rivers.
  • They have sieve-like structures inside the bill used to capture aquatic insects and their larva.
  • Whio have large, webbed feet that they can fold up like an umbrella to help stop drag in the fast-flowing rivers they live in.
  • Their body is streamlined to help water flow over it so they can effectively swim and dive.
  • Whio also have different types of feathers, each with specific qualities. As Whio live in very cold water, the insulating and waterproofing properties of their feathers are very important.
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