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WikiPedia: Họ Ưng http://www.ararajuba.org.br/sbo/ararajuba/artigos/... http://books.google.com/?id=SFP9P1i-PoEC&pg=PT60#v... http://books.google.com/?id=hlIztc05HTQC&pg=PA69#v... http://ibc.lynxeds.com/family/hawks-eagles-accipit... http://www.sciencedirect.com/science?_ob=ArticleUR... http://onlinelibrary.wiley.com/doi/10.1111/j.1439-... http://onlinelibrary.wiley.com/doi/10.1111/j.2007.... http://www.senckenberg.de/files/content/forschung/... http://www.uni-heidelberg.de/institute/fak14/ipmb/... http://www.austincc.edu