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.
Adopted on February 28, 1931. The Mountain Bluebird, (Sialia arctcia,) was adopted as the Idaho state bird by the state legislature on February 28, 1931. The Mountain Bluebird is a medium-sized thrush that breeds in open country across western North America, including mountain areas. Few birds are held in higher esteem than the bluebird.