Muscovy Duck x Mallard Cairina moschata x Anas platyrhynchos

Domestic Muscovy Ducks often hybridise with Mallards (themselves frequently domestic). Personally I've rarely encountered them in the flesh until recently, but there is an abundance of photos on the internet. Many are obvious but I'd overlooked the first one as a domestic variant of Mallard until Joern pointed it out.

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Probable domestic Mallard x domestic Muscovy Duck hybrid, Salthouse (Norfolk, UK), 16th February 2008

 

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three domestic Mallard x domestic Muscovy Duck hybrids, Tattersett (Norfolk, UK), 9th March 2011

 

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domestic Mallard x domestic Muscovy Duck hybrids, Tattersett (Norfolk, UK), 20th April 2011 (presumably two of the birds from above)

 

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domestic Mallard x domestic Muscovy Duck hybrid, Welney (Norfolk, UK), 29th November 2014

 

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domestic Mallard x domestic Muscovy Duck hybrid, Welney (Norfolk, UK), 10th January 2015 - same bird as above