See the world’s oldest fossilized ‘butthole’ imprint
Fossils show exceptionally rare evidence of a cloacal vent—the slit that most vertebrates use to excrete, have sex and lay egg—which could shed light on the evolution of the orifice
Fossils show exceptionally rare evidence of a cloacal vent—the slit that most vertebrates use to excrete, have sex and lay egg—which could shed light on the evolution of the orifice
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