Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, magpies, jackdaws, jays, treepies, choughs, and nutcrackers. In colloquial terms, the crow family is made up of corvids; currently 135 species are included. The genus Corvus containing 47 species makes up over a third of the entire family. The raven is the largest passerine bird.