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Mallard age/plumage question.

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Southern Ontario today.

I came across three males this morning which appear to be moulting. It seems a little early here for adults (?) so maybe 1st summer birds coming into full plumage.

However, one of the three had only a partially yellow bill, wondering about diet deficiency (the other two were identical except for the bill).

Bit of a random question but any insights appreciated.


Mallard 1m moult bill colour HVT-7534538.jpg

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