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The original was posted on /r/todayilearned by /u/sconesandscream on 2025-07-04 19:47:35+00:00.

Original Title: TIL that a parasitic flatworm forms pulsing, brightly coloured sacs, called broodsacs, inside the tentacles of snails. It’s zombifying, caterpillar-shaped parasite pod that exists solely to trick birds into spreading the flatworm.