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.
White-tailed Deer. Mississippi designated the white-tailed deer (Odocoileus virginianus) as official state land mammal in 1974 (along with Mississippi's state water mammal, the bottlenose dolphin). In 1997 the red fox was also recognized as a mammal symbol of Mississippi.