Sources:

• Animal Diversity Web - http://animaldiversity.org
• A-Z Animals - http://a-z-animals.com
• Chordate Systematics - http://www.pages.drexel.edu/~djc54/final/index.html
• MammalsRus - http://www.mammalsrus.com
• Palaeos - http://palaeos.com
• Reptile Evolution - http://www.reptileevolution.com
• Science News - https://www.sciencenews.org
• The Rise of Placental Mammals, Kenneth D. Rose and J. David Archibald, 2005
• The Tree of Life Project - http://tolweb.org/treehouses
• University of California Museum of Paleontology- http://www.ucmp.berkeley.edu
• Virtual Zoology Site:  https://brainly.com/insights/virtual-zoology-the-animal-kingdom-branch-of-biology Thanks Kelly! :D
• Wikipedia - http://en.wikipedia.org
• Wildlife in Dubai -  https://www.bayut.com/mybayut/wildlife-dubai   Thanks Evelyn! :)

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

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