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.
Nevada designated the mountain bluebird (Sialia currucoides) as the official state bird in 1967 (also the state bird of Idaho). A member of the thrush family, the mountain bluebird lives in Nevada's high country and sings with a clear, short warble.