Small, flightless dark brown duck, endemic to New Zealand. Males have green iridescence on head, dark chestnut-colored breast, and lightly barred flanks. Females are uniformly dark brown. Both sexes have distinct white eye-ring. Confined to the Auckland islands, where it occurs on all major islands except the main Auckland Island. Found on sheltered shorelines rummaging through windblown kelp piles. Also found on streams with adequate cover of tussock and sedges. Males give a soft trill as an alarm or territorial call. Females give a growl and a rapid quack. Distinguished from other New Zealand endemic teal species by location and light barring on sides.