California golden beaver

Castor canadensis
A male North American beaver
Conservation status
Least Concern (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Castoridae
Genus:	Castor
Species:	C. canadensis
Binomial name
Castor canadensis Kuhl, 1820
Subspecies
List C. c. acadicus Bailey and Doutt, 1942 C. c. baileyi Nelson, 1927 C. c. belugae Taylor, 1916 Cook Inlet beaver C. c. caecator Bangs (1913:513) Newfoundland beaver C. c. canadensis Kuhl 1820 Canadian beaver C. c. carolinensis Rhoads 1898 Carolina beaver C. c. concisor Warren and Hall, 1939 C. c. duchesnei Durrant and Crane, 1948 C. c. frondator Mearns, 1897 Sonora beaver C. c. idoneus Jewett and Hall, 1940 C. c. labradorensis Bailey and Doutt, 1942 C. c. leucodonta Gray, 1869 Pacific beaver C. c. mexicanus Bailey, 1913 Rio Grande beaver C. c. michiganensis Bailey 1913 Woods beaver C. c. missouriensis Bailey 1919 Missouri River beaver C. c. pacificus Rhoads 1892 Washington beaver C. c. pallidus Durrant and Crane, 1948 C. c. phaeus Heller, 1909 Admiralty beaver C. c. repentinus Goldman, 1932 C. c. rostralis Durrant and Crane, 1948 C. c. sagittatus Benson, 1933 C. c. shastensis (Taylor, 1916) Shasta beaver C. c. subauratus (Taylor, 1912) California golden beaver C. c. taylori Davis, 1939 C. c. texensis Bailey, 1905 Texas beaver
Distribution of the North American beaver (dark green – native, light green – introduced)

The North American beaver (Castor canadensis) is one of two extant beaver species. It is native to North America and introduced to Patagonia in South America and some European countries (e.g. Finland). In the United States and Canada, 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". 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. The North American beaver is an official animal symbol of Canada and is the official state mammal of Oregon.

This beaver is the largest rodent in North America and competes with its Eurasian counterpart, the European beaver, for being the second-largest in the world, both following the South American capybara. 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 lb). However, adults of both sexes averaged 16.8 kg (37 lb) in Ohio. The species seems to conform to Bergmann's rule, as northern animals appear to be larger. In the Northwest Territory, adults weighed a median of 20.5 kg (45 lb). The American beaver is slightly less large in average body mass than the Eurasian species. The head-and-body length of adult North American beavers is 74–90 cm (29–35 in), with the tail adding a further 20–35 cm (7.9–13.8 in). Very old individuals can exceptionally exceed normal sizes, weighing more than 40 kg (88 lb) or even as much as 50 kg (110 lb) (higher than the maximum known for the Eurasian beaver).

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Wikipedia