though they only travel a few feet, earthworms undergo a "vertical"
migration each spring after the ground thaws. The
appearance of the first earthworms is a welcome sign of spring.
It is often closely tied to the arrival of the first robins.
More! Read the description of earthworm
migration as quoted from Edwin Way Teale's NORTH WITH THE SPRING.
Also see these related
you see your Earthworms, let us know!
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