When I first hunted these woods, there wasn't a bird to be found in them. After pounding the squirrels hard for a few years, I noticed more and more birds in the woods. Now that's mostly what I notice, small birds. Red squirrels are detrimental to the small bird population. If they find their nests, say goodbye to the eggs and/or babies. That's primarily why I shoot them.
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https://youtu.be/NAMmXVXFLts