According to the Alaska Department of Fish and Game, while both male and  female reindeer grow antlers in the summer each year (the only members of the deer family, Cervidae, to have females that do so), 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 Rudolf to Blitzen........had to be a female.

We should've known this when they were able to find their way...

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