References
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HCPS Curriculum Guide. (2002). Animal Adaptations. Bel Air, MD: Harford County Public Schools.
Herrick, Seth. (n. d.). Hippopotamus: Who Zoo. Retrieved November 28, 2004 from http://www.whozoo.org/Intro98/herrick/sethherr.htm#adaptation.
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Tesler, Pearl. (1999). The Amazing Adaptable Frog. Retrieved November 28, 2004 from http://www.exploratorium.edu/frogs/mainstory/index.html.