Sources:

-Assembling The Tree of Life, Joel Cracraft and Michael J. Donohue, 2004
-Bird Families of the World - http://creagrus.home.montereybay.com
-Oiseaux-birds.com - http://www.oiseaux-birds.com
-The Complete Dinosaur, Second Edition, M.K. Brett-Surman, Thomas R. Hotlz, Jr., James O. Farlow, Indiana University Press, 2012
-Wikipedia - http://en.wikipedia.org

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

Some rights reserved. This work is licensed under a Creative Commons Atribution-NonCommercial-Share Alike 3.0 License.

You can watch more of Álvaro García´s artistic work at http://viuh.deviantart.com