It’s just classic mimicry. Any organism may develop a specific shape altering phenotype due to random mutations, if the phenotype gets it closer to a shape where the probability of it getting attacked is reduced, the mutation persists in the gene pool. Over time the phenotype gets refined and refined until it looks intentional. If this organism happens to reside in a region where another organism is avoided by predators, then a mutation that gets it to look similar to that organism will increase its fitness. And so it eventually mimics it. It’s still random chance, but the selective pressure is not random, and it’s skewed to favor the shape of this other organism, which is why the organism may evolve towards it.
They don’t know, they just evolved that way over time as plants that look like nettles don’t get eaten so much. The same reason giraffes that have longer necks can reach the higher leaves on the trees are less likely to starve, so they are therefore more likely to continue propagating their species.
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