It turns out that where we are, in southern Minnesota, robins do over-winter. We are in a chunk of their range where robins stay put. Or maybe the robins we see in winter here came from somewhere up in Canada or Alaska, the northern parts of their summer range, while the robins we see in the summer took off south themselves when the days grew short.
I wonder if anyone has ever tagged robins with radio transmitters to answer that question? My robin research can only go so far, so don't count on me for that answer!
However, there is a cool site Cornell Lab of Ornithology has put together which seems pretty definitive about robins and North American birds in general: http://www.birds.cornell.edu/
All About Birds by the same folks seems like it would be especially useful for school aged kids (who tend to soak up all kinds of information) with an interest in birds. When my kids were little and we were homeschooling them, the internet wasn't as prominent as it is now. But if it had been, we would definitely have bookmarked this site.
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