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.
The willow ptarmigan was designated the official state bird of Alaska in 1955. There are three kinds of ptarmigan and all can be found in Alaska-the willow ptarmigan and rock ptarmigan (which are also found in Scandinavia, Russia, and northern Eurasia), and white-tailed ptarmigan (found only in North America).