Today I learned about Aachenosaurus, a genus of plant that was named after fossilized wood was mistakenly identified as a dinosaur fossil. The discoverer, Gerard Smets, was so embarrassed by his mistake that he withdrew from science completely. en.wikipedia.org/wiki/Aac…
The Brontosaurus was thought to be a mistake, the creature had never existed. The animal was actually an Apatosaurus, a previously discovered dinosaur, and it should have had that name. Now it's been discovered that they actually are two separate animals, and the Brontosaurus exists again. scientificamerican.com/ar…
Hydras, tiny freshwater animals, have to rip their own skin apart just to open their mouth eurekalert.org/pub_releas…

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