Clam·a·to·res n. pl.  Zool. A division of passerine birds in which the vocal muscles are but little developed, so that they lack the power of singing.

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 Clamatores
      n : used in some classification systems; a suborder or
          superfamily nearly coextensive with suborder Tyranni;
          Passeriformes having relatively simple vocal organs and
          little power of song: clamatorial birds [syn: {suborder
          Clamatores]