Noted two Common Ravens in Kunkel WMA (southern Mille Lacs County) this
morning. Also noted one in central Mille Lacs County along 169 last
Saturday.
Have only lived in Minnesota for six years, but have observed a southern
movement of Common Ravens from northern Mille Lacs County/Crow Wing/Aitkin
(say, Kathio State Park area as a southern boundary) into central and
southern Mille Lacs County, Sherburne Refuge/Ann Lake/Sand Dunes, and Carlos
Avery.
Have others noted this? Are there any studies or systematic observations
about this phenomenon? Is it being observed elsewhere? Any thoughts as to
whether this is a temporary phenomenon (such as the Tufted Titmice northern
movement in the upper Midwest, advancing and declining over the last 40
years), or more permanent?
Thanks!
Al Schirmacher
Princeton, MN
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