The Castoridae family was once comprised of a wide array of species, but is now restricted to two extant members within the same genera. Their skull has a flat profile with powerful jaws and dentition in order to acquire food sources and construction materials (trees). As semi-aquatic members of the order Rodentia, castorids have the ability to chew underwater by creating a tight seal with their lips.
References Forsyth, A. 1985. Mammals of the Canadian Wild. Camden House Publishing, Camden, Ontario.
Myers, P. 2000. " Castoridae " (On-line), Animal Diversity Web. <http://animaldiversity.ummz.umich.edu/site/accounts/information/castoridae.html>. Accessed October 28, 2009.
Note: The species listed within this family only represent species for which the Hubbard Collection has specimens. It does not represent all existing species within this family.