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The beaver is the largest rodent in North America and competes with its Eurasian counterpart, the European beaver, for being the third-largest in the world, both following the South American capybara and lesser capybara. The European species is slightly larger on average but the American has a larger known maximum size.
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]
Skulls of a European and North American beaver. Although the Eurasian beaver appears superficially similar to the North American beaver, there are several important differences, chief among these being that the North American beaver has 40 chromosomes, while the Eurasian beaver has 48. The two species are not genetically compatible: the result ...
North American beavers (Castor canadensis) are the largest rodent species in the United States and the second largest in the world. They have stocky bodies, weigh between 35 and 65 pounds, and are ...
Rodents make up the largest order of mammals, with over 40% of mammalian species. They have two incisors in the upper and lower jaw which grow continually, and must be kept short by gnawing. Beaver. Family Castoridae (beavers) Genus: Castor. North American beaver, C. canadensis LC; Muskrat. Family Cricetidae (New World mice, rats, voles ...
Beaver. North American beaver (Castor canadensis) — found in small and large low-gradient streams, including tidal parts of the lower Connecticut River, as well as lakes and other water that is both permanently present and deep enough not to freeze all the way to the bottom in winter; most common where its favorite food plants are (such as ...