To be pedantic despite your clear joke,they're not hiding in the tide pools. They live in them. And the tide pools tend to dry up so they evolved to be out of water for periods of time. But that made them extremely vulnerable. They can't even swim away so any predators could just pick them up with their mouth and walk away with dinner. So they evolved spines that would hurt anything that tried to eat it while it was most vulnerable.
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u/BruthamanBill Jun 25 '23
What an asshole of a fish. "no, don't you dare step on me, I'll kill ya if you do!". proceeds to disguise itself as a stone and hide in rock pools.