It’s called aposematic signalling- basically a big, dramatic display that warns others that you’re toxic/taste bad/are otherwise nasty to mess with.
Interestingly, it’s common for distantly related species to converge to have a similar aposematic pattern/appearance. If both/all parties are actually noxious/dangerous, it’s called Mullerian mimicry. If one species is actually safe and tasty, but *looks* like a noxious species, it’s called Batesian mimicry.
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