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{{Taxobox| color = pink| name = American Beaver| status = LR/lc| image = Castor canadensis.jpg| image_width = 200px| regnum = Animalia]| classis = Mammalia]ia| familia = Beaver| genus = Beaver| species = C. canadensis| binomial = Castor canadensis| binomial_authority = Heinrich Kuhl, 1820| subdivision_ranks = Subspecies MSW Synonym List. Mammal Species of the World. Smithsonian Institution, 1993.Warner, Richard E. and Kathleen M. Hendrix, editors. California Riparian Systems: Ecology, Conservation, and Productive Management University of California Press, 1984, p. 952. Retrieved on 2007-08-04. Browse Genus equals Castor by Scientific Name for All Museums. Berkeley Natural History Museums. Retrieved on 2007-08-04.Tesky, Julie L. Wildlife Species: Castor canadensis Fire Effects Information System (Online), U.S. Department of Agriculture, Forest Service,Rocky Mountain Research Station, Fire Sciences Laboratory. 1993. Retrieved on 2007-08-04.| subdivision = -->The American Beaver (Castor canadensis) is a large semi-aquatic rodent native to Canada, much of the United States, parts of northern Mexico, and they were introduced in the most southern province of Argentina, Tierra del Fuego, and they adapted to its temperate forests many years ago. Common names include North American Beaver, or simply Beaver in North America, as well as its subspecies names, the most common being the Canadian Beaver.

Description Its fur has a range of many colors but is usually seen as dark brown. The beaver coat comprises two types of hair. The outer section is coarse and long and covers an inner layer which is much finer. It has a rounded head, a large flat paddle-shaped tail and webbed hind feet. The unwebbed front paws are smaller, with claws. This is the largest rodent found in North America and the second largest rodent in the world (the largest rodent being the South American capybara).

Beavers are mainly active at night. They are excellent swimmers but are more vulnerable on land and tend to remain in the water as much as possible. They are able to remain submerged for up to 15 minutes. A scent gland near their genitals secretes an oily substance known as castoreum which is used to waterproof its fur. A thick layer of fat under its skin insulates the beaver from its cold water environment. The eyes are covered by a nictitating membrane which allows the beaver to see underwater. Their nostrils and ears are sealed while submerged. The flat, scaly tail is used to signal danger and also serves as a source of fat storage.

They construct their homes, or "lodges," out of sticks, twigs, and mud in lakes or streams. These lodges may be surrounded by water, or touching land, including burrows dug into river banks. They are well known for building dams across streams and constructing their lodge in the artificial pond which forms. The entrance to the lodge or burrow is located underwater. In the event of danger, a beaver slaps its tail on the water to warn other family members.

The dam is constructed using sections of deciduous trees, especially birch, aspen, willow and poplar. The inner bark, twigs, shoots and leaves of such trees are also an important part of the beaver's diet. The trees are cut down using their strong incisor teeth. Their front paws are used for digging and carrying and placing materials. Some researchers have shown that the sound of running water dictates when and where a beaver builds its dam.

During the summer, beavers also eat grasses, cattails, water lily and other aquatic plants.

Besides providing a safe home for the beaver, beaver ponds also provide habitat for waterfowl and other aquatic animals. Their dams help reduce soil erosion and can help reduce flooding.

Beavers usually mate for life. The young beaver "kits" typically remain with their parents for up to two years.

Subspecies There are 25 subspecies of the American Beaver, but different subspecies have been reintroduced to areas with previously geographically isolated subspecies, following population decline or extirpation of the indigenous subspecies. This has led to very substantial mixing of the subspecies gene pools, and some subspecies may have disappeared entirely.

The most widespread subspecies in North America are C. c. acadicus, C. c. canadensis (Canadian beaver), C. c. carolinensis (Carolina beaver), and C. c. missouriensis (Missouri River beaver).Baker, B. W., and E. P. Hill. Beaver (Castor canadensis). G. A. Feldhamer, B. C. Thompson, and J. A. Chapman, editors. Wild Mammals of North America: Biology, Management, and Conservation. Second Edition. The Johns Hopkins University Press, Baltimore, Maryland, USA, pp. 288-310. 2003. Retrieved on 2007-08-04. The Canadian beaver originally inhabited almost all of the forested area of Canada,Kieffer, Michael Meadows in Mist Bull Run Mountains Conservancy, Inc. Retrieved on 2007-08-04. and because of its more valued fur, was often selected for reintroductions elsewhere. The Carolina beaver is found in the southeastern United States, the Missouri River beaver, as its name suggests, is found in the Missouri River and its tributaries, and C. c. acadicus is found throughout the New England area in the northeastern United States.

Threats These animals are considered pest (animal)s in some parts of their range because their dams can cause flooding in nearby areas. They are incredibly persistent in repairing any damage to the dam and the only way to make them stop is to remove them from the location. In 1999 Washington, DC's annual Cherry Blossom Festival was plagued by a family of beavers who lived in the Tidal Basin. The offenders were caught and removed, but not before damaging 14 cherry trees, including some of the largest and oldest trees.

These animals are often trapped for their fur. During the early 19th century, trapping eliminated this animal from most of its original range. The beaver furs were used to make clothing and top-hats. Much of the early exploration of North America was driven by the quest for this animal's fur. Native peoples and early settlers also ate this animal's meat. The current beaver population has been estimated to be 10 to 15 million; there may have originally been ten times that many beavers in North America before the days of the fur trade.

Common natural predators include Gray Wolf, Coyotes, and Cougar. Less significant predators include bears, which can dig into a lodge, wolverines, Northern river otter, Canadian lynx, bobcats, and mink.

The strong odor produced from the castor glands make the meat of the animal unappealing to many as a source of food.

An emerging problem is the descendants of an introduced population in Tierra del Fuego, Argentina. The escapees from a farmed population of 25 animals has bloomed to an estimated 100,000; the drastically different ecosystem has led to incredible environmental damage, as the ponds created by the beavers have no ecological purpose (wetlands do not form there as they do in the beavers' native territory) and there are no native, large predators. They have also been found to cross saltwater spaces to islands northward; a possible encroachment on the mainland has naturalists highly concerned.

The Beaver as Symbol One of the national symbols of Canada, the beaver is depicted on the Nickel (Canadian coin) and was on the first Canadian postage stamp, the Three Penny Beaver. It is also the state animal of Oregon and New York State, and a common school emblem for engineering schools, including the California Institute of Technology and the Massachusetts Institute of Technology, as well as the mascot for Oregon State University. The beaver also appears in the coat of arms of the University of Toronto and the London School of Economics.

In parts of North America, fried dough pastries known as "Fried dough#BeaverTailss" are eaten at outdoor events.

Gallery Image:AmericanBeaver pennsylvania.jpgImage:AmericanBeaver pennsylvania2.jpgImage:AmericanBeaver pennsylvania3.jpgImage:American Beavers at the National Zoo.jpg

Notes References

External links

{{Taxobox| color = pink| name = American Beaver| status = LR/lc| image = Castor canadensis.jpg| image_width = 200px| regnum = Animalia]| classis = Mammalia]ia| familia = Beaver| genus = Beaver| species = C. canadensis| binomial = Castor canadensis| binomial_authority = Heinrich Kuhl, 1820| subdivision_ranks = Subspecies MSW Synonym List. Mammal Species of the World. Smithsonian Institution, 1993.Warner, Richard E. and Kathleen M. Hendrix, editors. California Riparian Systems: Ecology, Conservation, and Productive Management University of California Press, 1984, p. 952. Retrieved on 2007-08-04. Browse Genus equals Castor by Scientific Name for All Museums. Berkeley Natural History Museums. Retrieved on 2007-08-04.Tesky, Julie L. Wildlife Species: Castor canadensis Fire Effects Information System (Online), U.S. Department of Agriculture, Forest Service,Rocky Mountain Research Station, Fire Sciences Laboratory. 1993. Retrieved on 2007-08-04.| subdivision = -->The American Beaver (Castor canadensis) is a large semi-aquatic rodent native to Canada, much of the United States, parts of northern Mexico, and they were introduced in the most southern province of Argentina, Tierra del Fuego, and they adapted to its temperate forests many years ago. Common names include North American Beaver, or simply Beaver in North America, as well as its subspecies names, the most common being the Canadian Beaver.

Description Its fur has a range of many colors but is usually seen as dark brown. The beaver coat comprises two types of hair. The outer section is coarse and long and covers an inner layer which is much finer. It has a rounded head, a large flat paddle-shaped tail and webbed hind feet. The unwebbed front paws are smaller, with claws. This is the largest rodent found in North America and the second largest rodent in the world (the largest rodent being the South American capybara).

Beavers are mainly active at night. They are excellent swimmers but are more vulnerable on land and tend to remain in the water as much as possible. They are able to remain submerged for up to 15 minutes. A scent gland near their genitals secretes an oily substance known as castoreum which is used to waterproof its fur. A thick layer of fat under its skin insulates the beaver from its cold water environment. The eyes are covered by a nictitating membrane which allows the beaver to see underwater. Their nostrils and ears are sealed while submerged. The flat, scaly tail is used to signal danger and also serves as a source of fat storage.

They construct their homes, or "lodges," out of sticks, twigs, and mud in lakes or streams. These lodges may be surrounded by water, or touching land, including burrows dug into river banks. They are well known for building dams across streams and constructing their lodge in the artificial pond which forms. The entrance to the lodge or burrow is located underwater. In the event of danger, a beaver slaps its tail on the water to warn other family members.

The dam is constructed using sections of deciduous trees, especially birch, aspen, willow and poplar. The inner bark, twigs, shoots and leaves of such trees are also an important part of the beaver's diet. The trees are cut down using their strong incisor teeth. Their front paws are used for digging and carrying and placing materials. Some researchers have shown that the sound of running water dictates when and where a beaver builds its dam.

During the summer, beavers also eat grasses, cattails, water lily and other aquatic plants.

Besides providing a safe home for the beaver, beaver ponds also provide habitat for waterfowl and other aquatic animals. Their dams help reduce soil erosion and can help reduce flooding.

Beavers usually mate for life. The young beaver "kits" typically remain with their parents for up to two years.

Subspecies There are 25 subspecies of the American Beaver, but different subspecies have been reintroduced to areas with previously geographically isolated subspecies, following population decline or extirpation of the indigenous subspecies. This has led to very substantial mixing of the subspecies gene pools, and some subspecies may have disappeared entirely.

The most widespread subspecies in North America are C. c. acadicus, C. c. canadensis (Canadian beaver), C. c. carolinensis (Carolina beaver), and C. c. missouriensis (Missouri River beaver).Baker, B. W., and E. P. Hill. Beaver (Castor canadensis). G. A. Feldhamer, B. C. Thompson, and J. A. Chapman, editors. Wild Mammals of North America: Biology, Management, and Conservation. Second Edition. The Johns Hopkins University Press, Baltimore, Maryland, USA, pp. 288-310. 2003. Retrieved on 2007-08-04. The Canadian beaver originally inhabited almost all of the forested area of Canada,Kieffer, Michael Meadows in Mist Bull Run Mountains Conservancy, Inc. Retrieved on 2007-08-04. and because of its more valued fur, was often selected for reintroductions elsewhere. The Carolina beaver is found in the southeastern United States, the Missouri River beaver, as its name suggests, is found in the Missouri River and its tributaries, and C. c. acadicus is found throughout the New England area in the northeastern United States.

Threats These animals are considered pest (animal)s in some parts of their range because their dams can cause flooding in nearby areas. They are incredibly persistent in repairing any damage to the dam and the only way to make them stop is to remove them from the location. In 1999 Washington, DC's annual Cherry Blossom Festival was plagued by a family of beavers who lived in the Tidal Basin. The offenders were caught and removed, but not before damaging 14 cherry trees, including some of the largest and oldest trees.

These animals are often trapped for their fur. During the early 19th century, trapping eliminated this animal from most of its original range. The beaver furs were used to make clothing and top-hats. Much of the early exploration of North America was driven by the quest for this animal's fur. Native peoples and early settlers also ate this animal's meat. The current beaver population has been estimated to be 10 to 15 million; there may have originally been ten times that many beavers in North America before the days of the fur trade.

Common natural predators include Gray Wolf, Coyotes, and Cougar. Less significant predators include bears, which can dig into a lodge, wolverines, Northern river otter, Canadian lynx, bobcats, and mink.

The strong odor produced from the castor glands make the meat of the animal unappealing to many as a source of food.

An emerging problem is the descendants of an introduced population in Tierra del Fuego, Argentina. The escapees from a farmed population of 25 animals has bloomed to an estimated 100,000; the drastically different ecosystem has led to incredible environmental damage, as the ponds created by the beavers have no ecological purpose (wetlands do not form there as they do in the beavers' native territory) and there are no native, large predators. They have also been found to cross saltwater spaces to islands northward; a possible encroachment on the mainland has naturalists highly concerned.

The Beaver as Symbol One of the national symbols of Canada, the beaver is depicted on the Nickel (Canadian coin) and was on the first Canadian postage stamp, the Three Penny Beaver. It is also the state animal of Oregon and New York State, and a common school emblem for engineering schools, including the California Institute of Technology and the Massachusetts Institute of Technology, as well as the mascot for Oregon State University. The beaver also appears in the coat of arms of the University of Toronto and the London School of Economics.

In parts of North America, fried dough pastries known as "Fried dough#BeaverTailss" are eaten at outdoor events.

Gallery Image:AmericanBeaver pennsylvania.jpgImage:AmericanBeaver pennsylvania2.jpgImage:AmericanBeaver pennsylvania3.jpgImage:American Beavers at the National Zoo.jpg

Notes References

External links



American Beaver - Wikipedia, the free encyclopedia
The American Beaver (Castor canadensis) is a large semi-aquatic rodent native to Canada, much of the United States, and parts of northern Mexico.

ADW: Castor canadensis: Information
American Beaver - Castor canadiensis" (On-line). Available http://sevilleta.unm.edu/data/species/mammal/sevilleta/profile/american-beaver.html (1 August 2002)

BBC - Science & Nature - Wildfacts - North American beaver, Canadian ...
A large herbivorous rodent adapted for swimming with webbed feet and a scaly paddle-like tail. It lives in family groups and alters the flow of water in its range by digging ...

Ski Beaver Creek, USA - Skiing and Snowboarding in the American Ski ...
Ski Beaver Creek, USA. Skiing and Snowboarding Holidays and Weekends in Beaver Creek, American ski resort. How to get to Beaver Creek, Vail Resorts. American Ski Condos and ...

Ski Beaver Mountain, USA - Skiing and Snowboarding in the American Ski ...
Ski Beaver Mountain, USA. Skiing and Snowboarding Holidays and Weekends in Beaver Mountain, American ski resort. How to get to Beaver Mountain, . American Ski Condos and Apartments ...

The American Beaver
Can live for ten to fifteen years Lives in family groups Is mostly active at night and sleeps during the day Has a round body, brown fur, webbed feet ...

American Beaver - National Zoo| FONZ
American beavers are one of the world's largest rodents. Brought to you by the National Zoo| FONZ.

WWF - Beaver (American)
Beaver's habitat - Lower Isar river near Platting, Germany. © WWF-Canon / Klaus-Henning GROTH

gracialouise — Wooden American beaver
A medium-sized wooden beaver companion created for Secrets of the Photocopier (a recent exhibition at platform, Melbourne). This little American beaver from the family castoridae ...

Eaton Photography: Gallery
Gallery: Wildlife: American Beaver (Castor canadensis)

 

American Beaver



 
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