Blue Duck (Hymenolaimus malacorhynchos) video
Male and female birds swimming in strong current on river. These are wild birds being studied by researchers conducting predator control in the area. The smaller (female) bird is fitted with a transmitter; the antenna is attached to a tail feather and is visible in some frames.
Minimal genetic variation between NI and SI birds means existence of separate subspecies is no longer supported and requires validation. Ref: Checklist of the Birds of New Zealand, 4th ed. OSNZ 2010.