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 Characteristics of Class Aves. (n.d.). Retrieved May 29, 2015, from http://www.preservearticles.com/2011082011054/characteristics-of-class-aves.html  

 Characteristics of Class Reptilia. (n.d.). Retrieved May 29, 2015, from http://www.preservearticles.com/2011082011053/characteristics-of-class-reptilia.html  

 Agnathan | fish. (n.d.). Retrieved May 29, 2015, from http://www.britannica.com/EBchecked/topic/9280/agnathan  

 Agnathan | fish. (n.d.). Retrieved May 29, 2015, from http://www.britannica.com/EBchecked/topic/9280/agnathan  

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