Good cheer is a cardinal virtue. And what is more cheerful than waking up on a snowy morning to find your backyard full of cardinals? With all that red and white, who could be blue? Ever wonder why birds of a feather flock together? Maybe because it's easier than flocking apart. Or because that's where the vittles are. Is your bird feeder down to the last sunflower seed? Fill it fast - an empty bird feeder is a cardinal sin.