Joern Lehmhus
Well-known member
found by Micarusa and sent to me for identification help....
Micarusa informed me that this mallard-sized bird displayed as a male mallard, in a group with typically colored male mallards. It did the grunt-whistle, for example...
I first considered an intersex plumaged female, but with that behaviour this doesn´t seem likely. As far as i know, when showing male display behaviour , the duck in question should be male...
It also doesn´t match any of those mallard-like species with no developed breeding plumage, like Hawaiian duck, Pacific Black duck, Mottled duck, Mexican duck, American black duck or Laysan duck. It also doesn´t match first generation crosses of Mallard with any of these species...
So we do not know what to think here...
Maybe somebody else has encountered something similar or has an idea???