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ThoughtCo.: George Washington Carver

https://www.thoughtco.com/george-washington-carver-biography-1991496

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Wikipedia: Velociraptor

http://en.wikipedia.org/wiki/Velociraptor

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Parrot Fossil from the Cretaceous Pushes Back Origin of Modern Land Birds

http://www.berkeley.edu/news/berkeleyan/1998/1118/fossil.html

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North American Porcupine

http://www.adfg.alaska.gov/index.cfm?adfg=northamericanporcupine.main

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Collared Pika

http://www.adfg.alaska.gov/index.cfm?adfg=collaredpika.main

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Center for Applied Statistics and Data Analysis at University of Missouri

https://casda.missouri.edu/

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