See the world’s oldest fossilized ‘butthole’ imprint
Mar 04, 2026
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
https://www.scientificamerican.com/article/see-the-worlds-oldest-fossilized-butthole-imprint/
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