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Scientists working at the Messel Pit in Germany have discovered a pair of turtles fossilized in the act of doing the horizontal hula. As reported in the Live Science article Coitus Interruptus: Ancient Turtle Sex Fossilized:
The mating turtles may have been caught in a death trap as they sank to deeper layers of the lake, where they were having sex nearly 50 million years ago, the researchers speculate. The lake's deep layers may have held deadly volcanic gases or other toxins.