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.
Delaware has no Official State Animal but it does claim the Horseshoe Crab as the State Marine Animal and it also has an Official State Bird called the Blue Hen Chicken plus an Official State Fish, Bug, Butterfly and Macroinvertbrate.