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.
When Michigan became a state in 1837, nearly all of its land was forested. Northern Michigan was a mixture of conifer and hardwood forests dominated by hardwoods such as sugar maple, beech, yellow birch and oak, and softwoods such as pine, hemlock, spruce and fir. In contrast, most of the southern third of Michigan was covered by hardwood forests dominated by oak and hickory. Only a few small grasslands, called oak openings, with widely scattered white and black oak, were found in southern lower Michigan.