My son and I were taking photos on the Whau river for an upcoming business pollution prevention campaign, when we found 5 dead ducks, 1 dead Pukeko and this one partially paralysed duck. I called the councils hotline (09 377 310) and they sent someone out straight away, the scientist thinks it’s Avian Botulism. It looks like Pukeko can be affected (NZ Herald Link). So the only things that don’t match are that (as you can see in this photo) the ducks legs were paralysed and it could move its head just fine. Also the water is moving, tho maybe it’s stagnant further upstream. Case #14/0954
UPDATE: Water barely moving upstream (Olympic park).