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Ostracods are still alive today, and exhibit other odd mating behaviors, USA Today reports. Wire service provided by Associated Press. I'll try anything once Not a chance Vote. And many species have two sets of reproductive organs. In fact, the find is full of mysteries, including what happened to the ostracods just after mating, how they were immediately fossilized and why they stayed so well preserved for 17 million years. But with bats come bat poop, and bat poop has been known to preserve soft tissue for millions of years, The Washington Post reports.