Red-winged blackbird, the most famous American blackbird, has a body length of19-24cm, a wingspan of 30-37cm and a weight of 65g. In spring, the upper end of the male's feather wing is orange with a small piece of white, which looks like a general's red epaulettes. The head and claws are dark blue, and the feathers are all blue-black, which is named after the bright red shoulders and wings of the male bird. In autumn, the edges of feathers rust, and most of them live in swamps in North America.