nature is creepy at timesShades of the movie Alien. If you see a hornworm that looks like this, as if it had little white rice grains stuck to it - leave it.
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A tiny wasp has laid eggs on the hornworm. The larvae will consume it, from the inside. They emerge and pupate (that's what you see here.) Then hatch, at which point the weakened hornworm will die. The adult wasps fly off looking for more hornworms to parasitize.