A class of fifth-graders in Howell, Michigan spent two months studying the endangered Kirtland’s Warbler, compiling a book about the bird and concluding that it should replace the American Robin as their state bird. The bird nests primarily in Michigan (there are a few in Wisconsin, too) so it sounds like a good fit to me. (The American Robin is the state bird of Connecticut and Wisconsin as well. There are a couple of other birds that are the state bird of multiple states: the Northern Cardinal (7) and Western Meadowlark (6) come to mind. Nothing against these birds, but come on, how unoriginal!)
In case you’ve never seen this lovely bird, here’s a photo. What a beauty!

Endangered Kirtland’s warbler (Dendroica kirtlandii) by USFWS Headquarters, Creative Commons on Flickr
Read more about the students’ project here.