Mi·gra·to·ry a.
  1. Removing regularly or occasionally from one region or climate to another; as, migratory birds.
  2. Hence, roving; wandering; nomad; as, migratory habits; a migratory life.
  Migratory locust Zool. See Locust.
  Migratory thrush Zool., the American robin. See Robin.
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  migratory locust
       n : Old World locust that travels in vast swarms stripping large
           areas of vegetation [syn: Locusta migratoria]