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.
Before the Legislature decided on the loon as Minnesota's state bird, several other birds were suggested, including the Eastern goldfinch (1947), the mourning dove (1951), the pileated woodpecker (1951 and 1953), the scarlet tanager (1951) and the wood duck (1951).