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well, i have a feeling we might get into another debate, there just isnt a real positive way to know if they are or not. you may have hunted an area extensivily and all of a sudden there are a bunch of dumb birds that havent been in that area at all untill now, thats usually a good sign they are migrators. they are also sometimes in bigger flocks, up to 50-75 in some cases, and also seem to be a little bit bigger and more plumaged out than the locals you have been shooting
I agree with this. But, the locals will all have much better plumage come November too, the young of the year birds will have grwon a bit more, and their fat will be up, and we already covered the feet thing in another post. Long story short, IMO there isn’t any genetic difference between mallards from Canada and mallards from here, except in how far they migrate. A few years back, my buddy shot a banded mallard the last week in October. The next week, I shot a banded mallard on the same pond. His came back, from the earlier bird, as being about 8 years old and banded in Manitoba. Mine came back as 2 years old and banded in Holmen, WI. Both birds looked about the same plummage wise. We actually shot the Canada bird a week early than the local.
the longer the season is along the more likely you are to have shot “northern birds”, but I don’t think there is truly anyway to tell unless they are being tracked or carrying a passport.