In the Santa Claus tale, Santa Claus’s sleigh is pulled by flying reindeer. These were first named in the 1823 poem “A Visit from St. Nicholas”, where they are called Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Dunder, and Blixem. Dunder was later changed to Donder and—in other works—Donner (in German, “thunder”), and Blixem was later changed to Bliksem, then Blitzen (German for “lightning”). Some consider Rudolph as part of the group as well, though he was not part of the original named work referenced previously. Rudolph was added by Robert L. May in 1939 as “Rudolph the Red-Nosed Reindeer”.
It is likely that Rudolph the red nosed reindeer is really a female, scientists (with lots of spare time on their hands) have said. Male reindeer actually cast their antlers before Christmas, so they don’t have any antlers at Christmastime.
Females cast their antlers in spring, growing them back in time for winter when they need their antlers to compete with other females over holes they dig in the snow to reach lichens and to provide food for their offspring.
If Rudolph was not a female then the alternative is that he may have been a eunuch. When a male reindeer is castrated it stops the process of casting the antlers in the winter time, and they turn into being more like females.
If this is the case, don’t mess with Santa
Taken in a Gift Shop