Rodents - http://www.nhc.ed.ac.uk/index.php?page=24.134.166.171.193 The Natural History Collection at Edinburgh University provides information on the three main types of rodent characterized by their jaw musculature and differently shaped skulls. Photographs of skulls and information on the dentition of a number of species.
Order Rodentia - http://animaldiversity.ummz.umich.edu/chordata/mammalia/rodentia.html Characteristics of the order and descriptions of each of the 29 families from the Animal Diversity Web.
Hispaniolan Hutia - http://en.wikipedia.org/wiki/Hispaniolan_Hutia Information from Wikipedia on this endangered species, Plagiodontia aedium, including its description, behavior and ecology.
Puerto Rican Hutia (Isolobodon portoricensis) - http://www.edgeofexistence.org/mammals/species_info.php?id=32 Fact sheet from EDGE, a conservation organization that focuses specifically on threatened species that represent a significant amount of unique evolutionary history.
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