Hymenolaimus malacorhynchos
The Blue Duck, or Whio as it is known by Māori, is an iconic and highly specialized waterfowl endemic to New Zealand. This strikingly blue-grey duck, measuring 52-58 cm long and weighing 680-1000g, is instantly recognizable by its unique, soft pinkish-white bill with a black tip and a prominent white eye-ring. Males often exhibit rufous-chestnut flecking on the breast, a subtle sexual dimorphism. It holds a unique taxonomic position, being the sole member of its genus, *Hymenolaimus*, and rep...
This highly specialized duck inhabits fast-flowing, clear rivers and streams with high water quality, primarily within forested upland areas and montane regions of New Zealand.
Their diet consists almost exclusively of aquatic invertebrates, such as caddisfly larvae, stonefly larvae, and snails, which they scrape off submerged rocks with their specialized bill.
Blue Ducks are largely diurnal, spending their days foraging in turbulent waters and roosting on secluded riverbanks or under overhanging vegetation at night. They employ a unique foraging strategy, diving and probing with their specialized soft bill to scrape aquatic invertebrates from the under...
The Blue Duck is endemic to New Zealand, historically widespread across both the North and South Islands in suitable riverine habitats. Today, its distribution is severely fragmented, primarily confined to remote, forested upland rivers. In the North Island, significant populations persist in are...
Endangered
- The Māori name 'Whio' is onomatopoeic, derived from the distinctive whistling call of the male Blue Duck. - It is the only duck species in the world adapted to live year-round exclusively on fast-flowing, turbulent rivers. - Its unique, flexible, fleshy bill with fine lamellae is perfectly desi...