The symbolic images of Santa's reindeer have many horns on their heads. According to research, male reindeer often lose their horns in winter while females do not Beautiful This Is My Ugly Christmas Sweater shirt . In the cartoons about Santa and the reindeer, there are some with red noses, that's because the blood vessels under the nose are actively warming and regulating the body temperature for the reindeer. In particular, he discovered Rudolph - a reindeer with a glowing red nose. So Santa let Rudolph lead his rickshaw.