> birds are divided into passerines and everything else Not quite. Aves is divided into Palaeognathae (which includes Ostriches, rheas, kiwis and emus amongst

> birds are divided into passerines and everything else Not quite. Aves is divided into Palaeognathae (which includes Ostriches, rheas, kiwis and emus amongst others) and Neognathae. Passerine is the largest order within Neognathae, but sits along side pigeons, ducks, flamingos and some others. (source: someone who is trying to learn the complex classifications embodied within 'raptor')