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.
Missouri's state bir d is the Bluebird. This bird became Missouri's state bird on March 30, 1927. These birds are supposed to be a symbol of happiness. This bird has red, blue, and white feathers. People only see these birds from Spring until Fall.