Now, if Santa is alive, scientifically speaking, he should die from the sheer force of 4,315,015 pounds pushing against him as he flies through the sky. Reindeer, as we know them, do not fly. They stay on the ground, but there is a good amount of species of organisms to be discovered, which doesn't rule out flying reindeer. If reindeer could fly and carry Santa, an overweight man, (plus a sleigh, and don't get me started on the presents), they'd have to be extremely strong. Finally, the reindeer would have to fly at 3,000 times the speed of sound. They'd most likely burst into flames like a meteor through the Earth's atmosphere.