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The original was posted on /r/todayilearned by /u/JaguarMajor7840 on 2025-07-26 02:19:29+00:00.

Original Title: TIL roly pollies (aka pill bugs or woodlouses) aren’t insects but are instead crustaceans. They’re closely related to lobsters and crabs, so they have gills that have adapted to extract oxygen from air instead of water.