The return of the red-winged blackbird (Agelaius phoeniceus) is a reliable sign of Spring in Kalamazoo. After wintering in the south, the males fly hundreds of miles to claim their breeding territory. I often hear their calls before I see them. The females return later.
Richard Brewer has an interesting post on Signs of Spring in southwest Michigan.
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.