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 Bird. On March 30, 1927, the native bluebird became the official state bird of Missouri. The bluebird, considered a symbol of happiness, is usually 6 1/2 to 7 inches long. While its upper parts are covered with light blue plumage, its breast is cinnamon red, turning rust-colored in the fall. The bluebird is common in Missouri from early spring until late November.