<human>: Question: What is the number range of living bird species?
Answer: 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.
 Is the question answered in a satisfactory fashion?

OPTIONS:
- yes
- no
<bot>: no