User blog comment:Tawnypeltlover/IT.......HAS.........HAPPENED.................../@comment-1839575-20100806214943

Yes, they do. DUH. It's a fact of biology. All female mammals do, unless they are a pet and are desexed. It's also when they come on heat, which is different for humans, so actually WE'RE lucky.

Both my parents are biologists. I've known more about animals than people since I was about four.