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Assuming you mean they raise their abdomen in the air... It's commonly seen in newly-hatched Spiders. In order to disperse after hatching, they raise their abdomens in the air, and eject a line of silk. The 'spiderlings' are so light, that the slighest breeze will lift the silk thread and the spider often high into the air - and carry them away to start their new independent life.

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11y ago

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