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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. 
Well-researched biography of illustrator who revolutionized field guides, and educated, influenced and entertained generations of birders. Peterson's field guides were renowned for accurate illustrations (with arrows pointing out helpful field marks) and brief descriptions that made birding accessible. Although it's a slow read with lots of name dropping, it communicates the magic of a much-admired man who inspired countless birders. Shows Roger Tory Peterson's many sides - prolific workaholic, author, teacher, photographer, intellectual and explorer who was also somewhat vain and competitive. Discusses the stages of his life, motivations, influences, and other interests such as butterflies and wildflowers.