Hawaiian Duck, also known as Koloa, is a medium-sized duck, similar to a female Mallard in appearance, but smaller and darker. Both sexes have spotted tail feathers. The bill is dark greenish, with an orange tip in some females. This duck is a native species found exclusively in the Hawaiian Islands; this one is at Sylvan Heights Bird Park. This beautiful duck exhibits a stunning combination of mottled brown plumage and a distinctive white eye-ring.

Hawaiian Duck