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 robin's claim to the title of official state bird of Michigan has been challenged from a group of 3rd, 4th, & 5th graders. They arrived at the state capital in 2003 to lobby for the Kirtland's Warbler as the state bird of Michigan.