Imagine if you got pregnant a couple of years after having sex with a dude? Imagine if you got pregnant without ever having sex? An eastern diamond rattlesnake recently gave birth five years after mating. She just stored the sperm until she felt like it was the right time. Even crazier, a female copperhead snake that had been on exhibit — without a mate — for years at the North Carolina Aquarium suddenly gave birth to four "normal-looking" offspring. Mate-less reproduction is called parthenogenesis. And it's real. Virgin births: Not just for the Bible!