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 till after they give birth in the
spring.
Therefore, according to every historical rendition depicting
Santa’s reindeer, every single one of them, from Rudolph to
Blitzen- had to be a girl.
We should’ve 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.