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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.
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).
This file photo shows an X-ray image, taken on April 22, 2021, of the skull and teeth of Frances, a North American beaver who lived at the Utica Zoo. At the time, Frances' top teeth had already ...
If a beaver does stay in a lodge or underwater, it can be hard for them to tell night from day. In essence their days "get longer," which can impact how long they sleep too. This is all to say ...
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 :
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