The North American beaver (Castor canadensis) is one of two surviving beaver species. It is local to North America and acquainted with Patagonia in South America and some European nations (e.g., Norway). In the United States and Canada, the species is frequently alluded to just as "beaver", however this causes some perplexity in light of the fact that another indirectly related rat, Aplodontia rufa, is regularly called the "mountain beaver". Other vernacular names, including American beaver and Canadian beaver,recognize this species from the other surviving beaver species, Castor fiber, which is local to Eurasia. The North American beaver is the national creature of Canada.
This beaver is the biggest rat in North America and contends with its Eurasian partner, the European beaver, for being the second-biggest on the planet, both after the South American capybara. Grown-ups for the most part weigh from 11 to 32 kg (24 to 71 lb), with 20 kg (44 lb) being commonplace. The head-and-body length is 74–90 cm (29–35 in), with the tail including a further 20–35 cm (7.9–13.8 in). Extremely old people can particularly surpass ordinary sizes, measuring more than 40 kg (88 lb) or even as much as 50 kg (110 lb)
Like the capybara, the beaver is semi-oceanic. The beaver has numerous attributes suited to this way of life. It has an expansive level oar formed tail and vast, webbed rear feet. The unwebbed front paws are littler, with paws. The eyes are secured by a nictitating layer which permits the beaver to see submerged. The nostrils and ears are fixed while submerged. A thick layer of fat under its skin protects the beaver from its chilly water environment.
The beaver's hide comprises of long, coarse external hairs and short, fine internal hairs (see Double coat). The hide has a scope of hues however for the most part is dim chestnut. Fragrance organs close to the privates discharge a slick substance known as castoreum, which the beaver uses to waterproof its hide.
Before their close extirpation by catching in North America, beaver were for all intents and purposes pervasive and lived from the ice tundra to the deserts of northern Mexico, and from the Atlantic to the Pacific Oceans. Physician naturalist Edgar Alexander Mearns' 1907 report of beaver on the Sonora River might be the southernmost degree of the scope of this North American amphibian mammal. However, beaver have additionally been accounted for both truly and contemporaneously in Mexico on the Colorado River, Bavispe River and San Bernardino River.