According to the US 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, however, retain their antlers until 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 female."

The comment was included, "We should've known this when they were able to find their way."

That has nothing to do with the sermon other than serve to introduce us to our lesson from the Gospel of Luke which, above all the books in the New Testament, highlights women.