In the Passerine order, not the least remarkable displays are witnessed in birds that are not accounted songsters, as they do not possess the highly developed vocal organ confined to the suborder Oscines.    From Wordnik.com.  [The Naturalist in La Plata] Reference

Oscines.    From Wordnik.com.  [The Orbis Pictus] Reference

Oscines 27.    From Wordnik.com.  [The Orbis Pictus] Reference