From The Collaborative International Dictionary of English v.0.48:

nightcrawler \nightcrawler\ n.
   A terrestrial worm that burrows into and helps aerate soil;
   an earthworm. It often surfaces when the ground is cool or
   wet, and is used as bait by anglers. The term is used mostly
   in the northern and western U. S.

   Syn: earthworm, angleworm, fishworm, fishing worm, wiggler,
        nightwalker, dew worm, red worm.
        [WordNet 1.5]
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