Source : WordNet®

Passeriformes
     n : largest order of birds comprising about half the known
         species; rooks; finches; sparrows; tits; warblers;
         robins; wrens; swallows; etc.; the four suborders are
         Eurylaimi and Tyranni and Menurae and Oscines or Passeres
         [syn: {order Passeriformes}]