References

References

 

S.K. Eltringham. The Hippos. Bloomsbury Publishing, 2010.

Animals, a visual encyclopedia. Smithsonian. 2012. Pp. 100, 102.

Alderton, David. The encyclopedia of animals. Chartwell books, Inc., 2009. Pág.85

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

http://animals.sandiegozoo.org/

www.iucnredlist.org

http://library.sandiegozoo.org/factsheets/hippo/hippo.htm

http://animaldiversity.org/accounts/Hippopotamus_amphibius/

http://pygmyhippofoundation.org/pygmy-hippos

http://www.awf.org/wildlife-conservation/hippopotamus