Article: Earthworms keep house: these ecosystem engineers collect and plant ragweed.(Life)

Unlike Richard Scarry's Lowly Worm, real worms don't drive cars or go to school. But the wriggly creatures appear to live a more purposeful life than previously thought. Earthworms deliberately gather and bury ragweed seeds from around their burrows, reports a new study in the Journal of Applied Ecology.

The findings fit with recent work documenting how nonnative earthworms are changing northern U.S. forests. Though native worms were wiped out from the northern United States in the last glaciation--only persisting south of the ice sheet and permafrost--European worms arrived with settlers. The worms are slowly changing deciduous forests by eating through the leaf litter ...

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