Ornithology Basic Bird Identification (PDF 45P)
This note covers the following topics related to birds: Size and Shape, Wing Bars, Tail Pattern, Breast and Throat and Flocking Behavior.
Author(s): Andrew Crosby
Birds Of The World An Online Bird Book
This website is designed to serve as an online bird book. For ease of comparison, there are many species of birds on a web page. There are also links to similar birds that further help to compare species.
Author(s): carolinabirds.org
Argentine Ornithology, Volume I
This book contains an account of the Passeres of the Argentine Republic, which, as at present known, number some 229 species.
Author(s): P. L. Sclater and W. H. Hudson