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.
State Bird: Willow Goldfinch. The goldfinch is a delicate little bird with a yellow body and black wings, and although it eventually became the official state bird, many other birds were considered for the title. In 1928, legislators let school children select the state bird and the meadowlark won hands-down.