Cold agglutinin disease. Cold agglutination - at body temperature, the antibodies do not attach to the red blood cells. At lower temperatures, however, the antibodies react to Ii antigens, bringing the red blood cells together, a process known as agglutination.
American Robin (Turdus migratorius). The robin red breast was designated as the state bird of Michigan by House Concurrent Resolution No. 30, the Senate concurring, on April 8, 1931.
Michigan's state stone, The Petoskey is the official state stone. It is found along the shores of Lake Michigan. The Mackinac Bridge is one of the longest suspension bridges in the world. Connecting the upper and lower peninsulas of Michigan, it spans 5 miles over the Straits of Mackinac, which is where Lake Michigan and Lake Huron meet. The Mighty Mac took 3 years to complete and was opened to traffic in 1957.