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  • Cat P posted an update in the group Group logo of Fact a Day 2022Fact a Day 2022 2 months, 1 week ago

    Caterpillars Move in a Wavelike Motion, From Back to Front
    Caterpillars with a full complement of prolegs move in a fairly predictable motion. Usually, the caterpillar will first anchor itself using the terminal pair of prolegs and then reach forward with one pair of legs at a time, starting from the hind end. There’s more going on than just leg action, though. The caterpillar’s blood pressure changes as it moves forward, and its gut, which is basically a cylinder suspended inside its body, advances in sync with the head and rear end. Inchworms and loopers, which have fewer prolegs, move by pulling their hind ends forward in contact with the thorax and then extending their front half.

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