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

http://www.flmnh.ufl.edu/fish/gallery/descript/nurseshark/nurseshark.htm

http://www.elasmodiver.com/nurse_shark.htm

http://animals.howstuffworks.com/fish/nurse-shark.htm

http://a-z-animals.com/animals/nurse-shark/

http://www.aquariumdomain.com/viewSpeciesMarine.php?id=64

http://www.merriam-webster.com/concise/nurse%20shark

http://www.abc.net.au/news/stories/2011/06/02/3233766.htm

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