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.
State Symbols Used on this Website. (for more, see Massachusetts Facts) Massachusetts State Bird - Chickadee. The Black-Capped Chickadee (Penthestes atricapillus) was adopted as the official State Bird by the Massachusetts Legislature on March 21, 1941. It is also known as the titmouse, tomtit, and the dickybird, and it is one of the most familiar of the North American birds.