- Habitat loss
The Hawaiian Duck, locally known as Koloa, is a non-migratory bird species that used to populate the main Hawaiian islands but is now in danger of extinction due to a variety of threats. Though it is a close relative of the Mallard, its adults have monochromatic colours with mottled brown bodies, bluish-green speculums, and orange-tinted legs and feet.
Unlike other birds that congregate in large groups, the Hawaiian Duck prefers to stay in pairs. Because of its wary and secretive nature, it rarely mingles with other animals. The only time it gets wet is when it is foraging for fish to prey.
Destruction of wetland habitats is one of the main culprits for the Hawaiian Duck population decline. And because suitable safe dwellings are limited, they are easy targets of predators and hunters. Another threat that is seriously overlooked is the prevalence of interbreeding with feral mallards which experts believe is what makes it difficult to find pure versions these days.