what is a bird

archaeopteryx by j3tdillo kiwi by allie_caulfield pheasant by adam_inglis
Archaeopteryx fossil; photo by j3tDillo, cc-by-nc-sa Kiwi; photo by Allie_Caulfield, cc-by Golden Pheasant; photo by Adam_Inglis, cc-by

 

Sources:

-Assembling The Tree of Life, Joel Cracraft and Michael J. Donohue, 2004
-The Variety of Life, Colin Tudge, 2000

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

 

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