Am persuaded to save my last post for a shorty, so here's an early festive joke instead:
According to the Alaska Department of Fish and Game, while both male and female reindeer grow antlers in the summer each year, male reindeer drop their antlers at the beginning of winter, usually late November to mid-December. Female reindeer retain their antlers until after they have given birth in the spring.
Therefore, if we are to go by every available depiction of Santa's entourage, every one of them - from Rudolph to Blitzen - is a girl.
We should have known. Only women, while pregnant, would be able to drag a fat man in a red velvet suit all around the world in one night and not get lost.