Both male and female reindeer grow antlers in the summer each year but 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 ... has to be a female.
The only wild Reindeer herd in the UK, is found in the Cairngorm Mountain range and was reintroduced from Scandinavia in the 1950's. Once widespread across Scotland, the time (possibly the 12th or 13th century, but equally possibly during the neolithic 8000 years ago) and reasons for their extinction are as yet unknown.
Named for the word “snow” in Finnish, Lumi the female Reindeer calf was born on April 25 at Austria’s Vienna Zoo. Only minutes after the 11-pound (5 kg) calf was delivered by female Reindeer Helmi, Lumi stood up on her thin and wobbly legs.
WL-DEER-72-FEMALE; Funny female reindeer with Christmas box
Although antlers may be considered a masculine symbol, goddesses and female shamans wear them. Deer women appear throughout world mythology. Bendis, Artemis, Elen of the Ways, Satet, and many reindeer goddesses. Female reindeer, btw, have antlers and they are among humanity's oldest deities. (For the less spiritual, you can just enjoy this photo as a sexy Hannibal cosplay.)