When a baby butterfly hatches from it's egg, it crawls out as a tiny worm called a larvae.
Another word for the butterfly larvae is a caterpillar.
Caterpillars spend almost their entire time looking for food. They mostly eat leaves.
Caterpillars don't have claws or teeth to fight with, so to protect themselves some have what look like scary eyes on their body, some make a stinky smell, and some are poisonous.
(from: wikipedia - butterfly)
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