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"Donkey." Wikipedia, the Free Encyclopedia. 26 Apr. 2010. Web. 26 Apr. 2010. <http://en.wikipedia.org/wiki/Donkey>.

"Sheep - History for Kids!" Kidipede - History and Science for Kids - Homework Help for Middle School. Ed. Dr. Karen Carr. 15 Jan. 2009. Web. 25 Apr. 2010. <http://www.historyforkids.org/learn/economy/sheep.htm>.