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Skulls of a European (left) and North American (right) beaver. Although North American beavers are superficially similar to the European beaver (Castor fiber), several important differences exist between the two species. North American beavers tend to be slightly smaller, with smaller, more rounded heads; shorter, wider muzzles; thicker, longer ...
C. ohioensis skull cast (right), compared to a North American beaver skull (left). The former is a cast of a specimen from Shelby County, Iowa. At the AMNH. Castoroides species were much larger than modern beavers. Their average length was approximately 1.9 m (6.2 ft), and they could grow as large as 2.2 m (7.2 ft).
Skull of a beaver. Castoridae is a family of rodents that contains the two living species of beavers and their fossil relatives. A formerly diverse group, only a single genus is extant today, Castor. Two other genera of "giant beavers", Castoroides and Trogontherium, became extinct in the Late Pleistocene.
There are two extant species: the North American beaver (Castor canadensis) and the Eurasian beaver (C. fiber). The Eurasian beaver is slightly longer and has a more lengthened skull, triangular nasal cavities (as opposed to the square ones of the North American species), a lighter fur color, and a narrower tail. [11]
The North American beaver is the state mammal of New York. The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature :
An estate auction transformed into a heated challenge to the legality of selling what was labeled a human skull originating in North America around the year 1400.
Beaver, Castor californicus. Castor californicus is an extinct species of beaver that lived in western North America from the end of the Miocene to the early Pleistocene. [2] Castor californicus was first discovered in Kettleman Hills in California, United States. The species was similar to but larger than the extant North American beaver, C ...
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