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Wiwaxia, Hallucigenia, Tully Monster and Anomalocaris if anyone’s wondering
Anomalocaris means “weird shrimp” so I get the feeling the Cambrian freaks out the nerds sometimes, too.
My favorite ancient critter (actually pre-Cambrian) is Omnidont which means “all teeth”.
Why did swords sticking out of brain need to evolve?
Great question! Do some science.
I’ll give you a starting place. Consider their mobility, camoflauge, protection, abilities of their predators, habits of their prey, and mating strategies.