1) Animal order 2) Order passeriformes 
[n] - largest order of birds comprising about half the known species: rooks
order Passeriformes noun 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...