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snow44
Hello! Caterpillars are green as a form of camouflage. This coloration prevents certain predators from hunting the insect. 

Cheers!
-10th Grader Snow.
They are green because they are prey animals and they mainly eat leaves right so they need camouflage to not be seen by predators. And they eat green leaves a lot so they need green for that so they don't get hunted while eating