Bibliography
http://www.animalcorner.co.uk/wildlife/hippos/hippo_common.html
http://library.sandiegozoo.org/factsheets/hippo/hippo.htm
http://kidcyber.com.au/topics/animals/hippopotamus/
http://www.lpzoo.org/animals/factsheet/pygmy-hippopotamus
http://www.ehow.com/info_8700612_adaptations-hippopotamus.html
http://dailyparasite.blogspot.com/2010/08/august-31-placobdelloides.html
http://library.sandiegozoo.org/factsheets/hippo/hippo.htm
http://kidcyber.com.au/topics/animals/hippopotamus/
http://www.lpzoo.org/animals/factsheet/pygmy-hippopotamus
http://www.ehow.com/info_8700612_adaptations-hippopotamus.html
http://dailyparasite.blogspot.com/2010/08/august-31-placobdelloides.html