canadensis, though a definitive genetic analysis has not been performed.

However, modern techniques generally use genetics rather than morphology to distinguish between subspecies, and currently the Integrated Taxonomic Information System (which provides authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world) does not recognize any subspecies of C. Subspecies Īt one time, 25 subspecies of beavers were identified in North America, with distinctions based primarily on slight morphological differences and geographical isolation at the time of discovery. The oldest fossil record of beavers in North America are of two beaver teeth near Dayville, Oregon, and are 7 million years old. The first fossil records of beaver are 10 to 12 million years old in Germany, and they are thought to have migrated to North America across the Bering Strait. The North American beaver is one of the official national wildlife of Canada symbols and is the official state mammal of Oregon and New York. Other vernacular names, including American beaver and Canadian beaver, distinguish this species from the other extant beaver species, Castor fiber, which is native to Eurasia. In Canada and the United States, the species is often referred to simply as 'beaver', though this causes some confusion because another distantly related rodent, Aplodontia rufa, is often called the ' mountain beaver'. It is native to North America and introduced in South America ( Patagonia) and Europe (primarily Finland and Karelia). The North American beaver ( Castor canadensis) is one of two extant beaver species, along with the Eurasian beaver ( Castor fiber).

subauratus (Taylor, 1912) ĭistribution of the North American beaver (dark green – native, light green – introduced)

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