Last week I found a hybrid Pintail x Mallard but only had poor long range views and correspondingly awful photos. The bird was luckily subsequently relocated close to the Opera building on the waterfront in Oslo and I was able to see it and take better photos yesterday. This is only the second time I have seen this hybrid after having found a different (based on plumage) male last spring although have seen what was likely a female of this hybrid combo and I find it very interesting to study such hybrids.
The bird was associating with urban Mallards which suggests to me that its mother (rather than father) was a Mallard as duckling are raised by their mother and would therefore learn from their mother. Østensjøvannet has had a female Pintail in winter residence for a number of years but by my logic she would not be the mother but there was a male that wintered in Oslo 2016/17 and this could well be the father as I assume he would have at least tried his luck with one of the female Mallards he was associating with.
|the bill markings alone are a pretty good indication of the parentage|
|here the broad white neck collar going up at the back and the long tail are also signs of Pintail but the bird does mostly resemble a Mallard|
|here it can be compared with 2 Mallards where the difference in bill colour, leg colour, bill shape, head colour and breast colour can be seen|
|the long tertial feathers are also a sign of Pintail|