I popped down for the BWT today... A first for me. However Lee Evans was there and he's saying its a BWT x Pochard hybrid.
Jon
I think he's claiming it as Blue-winged x Northern Shoveler hybrid. There are previous cases of
anas x
aythya hybrids but I don't know of any confirmed BWT x Pochard records.
With regards to the Grimley bird, the possibility of it being a hybrid was considered last night, especially as I was aware of the famous Daventry bird a couple of years ago. For anyone who is not aware of that bird see the pics
here,
here and
here.
The Daventry bird has an abnormally large bill which depending on posture appears remarkably Shoveler-like in some pictures more than others. The Grimley bird has a reasonably large bill but not as large as the Daventry bird and appears to be within normal variation given some of the shots of pure birds
here and
here.
The often quoted broken pale eye ring was my main concern last night and while the Grimley bird has one, it's not as prominent as I would of expected but having researched online, there are plenty of pictures of birds in the US with very faint or no obvious eye ring; eg
here (also note the variation in bill size) and
here.
One of the criticisms of the Daventry bird was the pale edge to the upper mandible but again this can be found on birds in the US eg;
here.
The question is, are we being too critical with some of these birds, when we are not used to seeing the full range of plumage and bare part variation within the species. You only have to closely scrutinise a flock of Common Teal to see how variable individual birds are.
The Grimley bird is certainly an educational individual to see, whatever it is, and well worth a visit.
Brian
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