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The European species is slightly larger on average but the American has a larger known maximum size. Adults usually weigh from 11 to 32 kg (24 to 71 lb), with 20 kg (44 lb) being typical. In New York, the average weight of adult male beavers was 18.9 kg (42 lb), while non-native females in Finland averaged 18.1 kg (40
Beavers (genus Castor) are large, ... [64] [81] [82] The presence of beavers can increase wild salmon and trout populations, and the average size of these fishes ...
By the average weights known, it appears to be the world's second heaviest rodent after the capybara, and is slightly larger and heavier than the North American beaver. [11] [12] [13] One exceptionally large recorded specimen weighed 31.7 kg (70 lb), but it is reportedly possible for the species to exceptionally exceed 40 kg (88 lb). [14]
Outsized male beaver specimens have been recorded up to 50 kg (110 lb), which is about twice the normal weight for a beaver, and 1.7 m (5.6 ft) in total length. [114] [115] The Eurasian beaver (C. fiber) is close to the same average size, but is known to top out around a mass of 31.7 kg (70 lb). [116]
The mountain beaver (Aplodontia rufa) [Note 1] is a North American rodent.It is the only living member of its genus, Aplodontia, and family, Aplodontiidae. [2] It should not be confused with true North American and Eurasian beavers, to which it is not closely related; [3] the mountain beaver is instead more closely related to squirrels, although its less-efficient renal system was thought to ...
Trees approaching a diameter of 90 centimetres (3.0 ft) may be used to construct a dam, although the average is 10 to 30 centimetres (3.9 to 11.8 in). Log length depends on the diameter of the tree and the size of the beaver. There are recorded cases of beavers felling trees of 45 metres (148 ft) tall and 115 centimetres (45 in) in diameter.
The North American porcupine has a long gestation period relative to other rodents, an average of 202 days. [38] By contrast, the North American beaver, which is comparable in size, has a gestation period of 128 days. [39] The eastern grey squirrel (Sciurus carolinensis) has a gestation period of just 44 days. [40]
Trappers in Alberta, Canada commonly assert North American river otters are major predators of North American beavers. [33] A 1994 river otter study reported findings of beaver remains in 27 of 1,191 scats analyzed. [33] However, many other studies did not report any findings of North American beaver remains in the scat sampled. [54] [57]