Did you know? Santa Claus's reindeer are all female. Here's why. [VID: Did you know? Santa Claus's reindeer are females. Here's why: Both male and female reindeer have antlers, which they shed and regrow each year. But bucks and does shed their antlers at different seasons. Doe reindeer keep their antlers through the winter, shedding them only when their calves are born in May. A buck drops his antlers as early as November, leaving him antler-free until the following spring. Therefore, the antle