All modern birds lie within the crown group Aves (alternately Neornithes), which has two subdivisions: the Palaeognathae , which includes the flightless ratites (such as the ostriches ) and the weak-flying tinamous , and the extremely diverse Neognathae , containing all other birds.  These two subdivisions are often given the rank of superorder ,  although Livezey and Zusi assigned them "cohort" rank.  Depending on the taxonomic viewpoint, the number of known living bird species varies anywhere from 9,800  to 10,050. 
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