Sources:

-Animal Diversity Web – www.animaldiversity.org
-BBC Nature - www.bbc.co.uk/nature/life/
-Encyclopedia of Life – www.eol.org
-The Rise of Placental Mammals, Kenneth D. Rose and J. David Archibald, 2005
-Wikipedia – www.en.wikipedia.org

Citation: García, A.I. 2015. The Tree Of Nature (Online) at http://thetreeofnature.com

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