The Blue Duck (Hymenolaimus malacorhynchos) is a member of the duck, goose and swan family Anatidae endemic to New Zealand. It is the only member of the genus Hymenolaimus, placed in the shelduck subfamily Tadorninae after previously being considered part of the paraphyletic "perching duck" assemblage. The Māori name, sometimes used in English, is whio, which is an onomatopoetic rendition of the males' call.
The Blue Duck is a dark slate-grey with a chestnut-flecked breast and a paler bill and eye. The pinkish-white bill has fleshy flaps of skin hanging from the sides of its tip. The male's call is an aspirated whistle, and the female's is a rattling growl. The Blue Duck is born with a green beak for just 8 hours after birth; where it then develops to its final colour.
This species is an endemic resident breeder in New Zealand, nesting in hollow logs, small caves and other sheltered spots. It is a rare duck, holding territories on fast flowing mountain rivers. It is a powerful swimmer even in strong currents, but is reluctant to fly. It is difficult to find, but not particularly wary when located.
Katherine Wilson Sheppard (10 March 1847 – 13 July 1934) was the most prominent member of New Zealand's women's suffrage movement, and is the country's most famous suffragette. She also appears on the NZ ten dollar note. Because New Zealand was the first country to introduce universal suffrage, Sheppard's work had a considerable impact on women's suffrage movements in other countries.
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