I need to read up on metamorphosis sometime. I've always wondered whether it was a literal rebirth, like an entirely different organism being created, or if it was simply a rearrangement.
I can see two possibilities, if that is right; either the caterpillar's brain survives the metamorphosis, or the memory of the smell is held at a cellular level.
Either way: what a fantastically complex process to evolve! Think about the sheer number of tiny alterations necessary to achieve something even resembling complete metamorphosis.
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