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The Beaver : Castor canadensis Beaver is a man’s best friend! Just kidding, but the Beaver is the largest semi-aquatic mammal in the order Rodentia. The family Castoridae contains a single genus Castor with two species: Castor canadensis, found in the New World, and Castor fiber, found in the Old World. The two species differ mainly in the shape of the nasal bones and are so much alike that some authorities consider them to be …

…only leave their lodges to feed on stored food supplies. During this time they live in total darkness and lose track of time. When the food supply around a beaver’s home is exhausted they move to another site and start again. Sources http://www.zoomdinosaurs.com/subjects/mammals/Beaver.shtml http://wrc.ce.ttu.edu/henrypage/ca-ca.html http://the-planet.net/co/animal/Abeaver.html http://www.enchantedlearning.com/subjects/mammals/rodent/Beavprintout.shtml