Who do boys like they're girls

On TV recently, because I suppose it’s seasonal, the travel programmes (and a cookery programme!) have been to Northern Scandinavia to feature reindeer. I’ve learned that 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. Or a cervine cross-dresser.