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WikiPedia: Họ_Kền_kền_Tân_thế_giới http://books.google.com/books?id=bxpXq_hMxfAC&pg=P... http://books.google.com/books?id=g6aOgkIbEwEC&pg=P... http://ibc.lynxeds.com/family/new-world-vultures-c... http://www.springerlink.com/content/v1021r87347084... http://www.senckenberg.de/files/content/forschung/... http://www.uni-heidelberg.de/institute/fak14/ipmb/... http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm... http://biology-web.nmsu.edu/houde/Parallel_radiati... http://si-pddr.si.edu/dspace/bitstream/10088/1563/... http://animaldiversity.ummz.umich.edu/site/account...