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.
Alabama State Bird-Yellowhammer-Colaptes auratus. The yellowhammer, also known as the northern flicker or yellow-shafted flicker, became the official state bird of Alabama in 1927.