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Late – Recent ( Castor canadensis) Kingdom: Phylum: Class: Order: Family: Subfamily: Genus: Castor, – Eurasian beaver – North American beaver † Distribution of C. Distribution of C. Fossils of C. Californicus The beaver ( Castor) is a large, primarily,.

Castor includes two species, the ( Castor canadensis) (native to North America) and ( Castor fiber) (). Beavers are known for building dams, canals, and lodges (homes).

They are the second-largest rodent in the world (after the ). Their colonies create one or more dams to provide still, deep water to protect against predators, and to float food and building material. The North American beaver population was once more than 60 million, but as of 1988 was 6–12 million. This population decline is the result of extensive hunting for fur, for glands used as medicine and perfume, and because the beavers' harvesting of trees and flooding of waterways may interfere with other land uses. Contents • • • • • • • • • • • • • • • • • • • • • • General Beavers, along with and, are rodents, a suborder of rodents mostly restricted to North America. Although just two closely related species exist today, beavers have a long fossil history in the Northern Hemisphere beginning in the, and many species of giant beaver existed until quite recently, such as in Europe, and in North America.

Beavers are known for their natural trait of building dams on rivers and streams, and building their homes (known as 'lodges') in the resulting pond. Beavers also build canals to float building materials that are difficult to haul over land. They use powerful front teeth to cut trees and other plants that they use both for building and for food. In the absence of existing ponds, beavers must construct dams before building their lodges.

First they place vertical poles, then fill between the poles with a crisscross of horizontally placed branches. They fill in the gaps between the branches with a combination of weeds and mud until the dam impounds sufficient water to surround the lodge. A beaver skeleton They are known for their alarm signal: when startled or frightened, a swimming beaver will rapidly dive while forcefully slapping the water with its broad tail, audible over great distances above and below water. This serves as a warning to beavers in the area.

Once a beaver has sounded the alarm, nearby beavers will dive and may not reemerge for some time. Beavers are slow on land, but are good swimmers, and can stay under water for as long as 15 minutes. Beavers are herbivores, and prefer the wood of,,,,, and trees. They also eat,, and. Beavers do not hibernate, but store sticks and logs in a pile in their ponds, eating the underbark. Some of the pile is generally above water and accumulates snow in the winter. This insulation of snow often keeps the water from freezing in and around the food pile, providing a location where beavers can breathe when outside their lodge.

Beavers have webbed hind-feet, and a broad, scaly tail. They have poor eyesight, but keen senses of hearing, smell, and touch. A beaver's teeth grow continuously so that they will not be worn down by chewing on wood. Their four incisors are composed of hard orange enamel on the front and a softer on the back. The chisel-like ends of incisors are maintained by their self-sharpening wear pattern. The enamel in a beaver's incisors contains iron and is more resistant to acid than enamel in the teeth of other mammals. Beavers continue to grow throughout their lives.

Adult specimens weighing over 25 kg (55 lb) are not uncommon. Females are as large as or larger than males of the same age, which is uncommon among.

Beavers live up to 24 years of age in the wild. Etymology The English word 'beaver' comes from the word beofor or befer (recorded earlier as bebr), which in turn sprang from the root *bebruz. In other include the bibar, the bjorr, the and bever, the bever, the bibar and the Biber. The Proto-Germanic word in turn came from the (PIE) word *bhebhrus, a reduplication of the PIE root *bher-, meaning 'brown' or 'bright', whose own descendants now include the bebras and the bobr, as well as the Germanic forms. Beaver tracks The North American and Eurasian beavers are the only members of the, contained in a single, Castor.

Research has shown the modern European and North American beaver populations to be distinct species and that is unlikely. Although superficially similar to each other, there are several important differences between the two species. Eurasian beavers tend to be slightly larger, with larger, less rounded heads, longer, narrower muzzles, thinner, shorter and lighter underfur, narrower, less oval-shaped tails and shorter shin bones, making them less capable of bipedal locomotion than the North American species.

Eurasian beavers have longer nasal bones than their North American cousins, with the widest point being at the end of the snout for the former, and in the middle for the latter. The nasal opening for the Eurasian species is triangular, unlike that of the North American race, which is square. The is rounded in the Eurasian beaver and triangular in the North American. The of the Eurasian beaver are larger and thin-walled with a large internal volume compared to that of the North American species. The guard hairs of the Eurasian beaver have a longer hollow medulla at their tips.

Fur colour is also different. Overall, 66% of Eurasian beavers have pale brown or beige fur, 20% have reddish brown, nearly 8% are brown and only 4% have blackish coats. In North American beavers, 50% have pale brown fur, 25% are reddish brown, 20% are brown and 6% are blackish.

The two species are not genetically compatible. North American beavers have 40, while Eurasian beavers have 48. More than 27 attempts were made in Russia to hybridize the two species, with one breeding between a male North American beaver and a female European resulting in a single stillborn kit.

These factors make interspecific breeding unlikely in areas where the two species' ranges overlap. Eurasian beaver. A Eurasian beaver The Eurasian beaver ( Castor fiber) was nearly hunted to in Europe, both for fur and for, a secretion from its scent gland believed to have medicinal properties.

However, the beaver is now being re-introduced throughout Europe. Several thousand live on the and the and in parts of. A thriving community lives in northeast Poland, and the Eurasian beaver also returned to the banks in Slovakia and the Czech Republic. They have been in Scotland (),, Austria, Netherlands, Serbia ( bog), Denmark (West ) and Bulgaria and are spreading to new locations. The beaver became extinct in Great Britain in the sixteenth century: reported in 1188 ( Itinerarium ii.iii) that it was to be found only in the in Wales and in one river in Scotland, though his observations are clearly second hand. In 2001, successfully introduced a family of beavers at Ham Fen, the last remaining ancient fenland in the county close to the town of; these are now established and are breeding. In October 2005, six Eurasian beavers were reintroduced to Britain in Lower Mill Estate in; in July 2007 a colony of four Eurasian beavers was established at in Lancashire, and a small population of probably Eurasian beavers is being monitored in Devon.

A trial re-introduction occurred in Scotland in May 2009. Feasibility studies for a reintroduction to Wales are at an advanced stage and a preliminary study for a reintroduction of beavers to the wild in England has recently been published. North American beaver. Surprised by a major snow melt, a beaver had to start its cut all over again The North American beaver ( Castor canadensis), also called the Canadian beaver (which is also the name of a subspecies), American beaver, or simply beaver in North America, is native to Canada, much of the United States and the states of Sonora and Chihuahua in northern Mexico. This species was introduced to the Argentine and Chilean Tierra del Fuego, as well as Finland, France, Poland and Russia.

The North American beavers prefer the (inner) bark of aspen and poplar but will also take birch, maple, willow, alder, black cherry, red oak, beech, ash, hornbeam and occasionally pine and spruce. They will also eat, and other aquatic vegetation, especially in the early spring (and contrary to widespread belief, they do not eat fish). These animals are often trapped for their fur.

During the early 19th century, trapping eliminated this animal from large portions of its original range. 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. Through trap and transfer and, beavers made a nearly complete recovery by the 1940s. The current beaver population has been estimated to be 10 to 15 million; one estimate claims that there may at one time have been as many as 90 million. These trees, up to 250 mm (9.8 in) in diameter, were felled by beavers in one night.

The habitat of the beaver is the, inclusive of stream bed. The actions of beavers for hundreds of thousands of years in the have kept these watery systems healthy and in good repair. The beaver works as a in an by creating that are used by many other species.

Next to humans, no other extant animal appears to do more to shape its landscape. Beavers potentially even affect. Beavers fell trees for several reasons.

They fell large mature trees, usually in strategic locations, to form the basis of a dam, but European beavers tend to use small diameter (. Beaver dams are created as a protection against predators, such as coyotes, wolves and bears, and to provide easy access to food during winter. Beavers always work at night and are prolific builders, carrying mud and stones with their fore-paws and timber between their teeth. Because of this, destroying a beaver dam without removing the beavers is difficult, especially if the dam is downstream of an active lodge. Beavers can rebuild such primary dams overnight, though they may not defend secondary dams as vigorously. Beavers may create a series of dams along a river. Beaver lodge, approx.

20-foot (6.1 m) diameter. The lodge has underwater entrances, which makes entry nearly impossible for any other animal, although have been seen living inside beaver lodges with the beavers who made them. Only a small amount of the lodge is actually used as a living area. Beavers dig out their dens with underwater entrances after they finish building the dams and lodge structures. There are typically two dens within the lodge, one for drying off after exiting the water and another, drier one, in which the family lives. Beaver lodges are constructed with the same materials as the dams, with little order or regularity of structure.

They seldom house more than four adults and six or eight juveniles. Some larger lodges have one or more partitions, but these are only posts of the main building left by the builders to support the roof. Usually, the dens have no connection with each other except by water. When the ice breaks up in spring, beavers usually leave their lodges and roam until just before autumn, when they return to their old lodges and gather their winter stock of wood. They seldom begin to repair the lodges until the frost sets in, and rarely finish the outer coating until the cold becomes severe. When they erect a new lodge, they fell the wood early in summer but seldom begin building until nearly the end of August. Water quality and beavers Beaver ponds, and the wetlands that succeed them, remove sediments and pollutants from waterways, including total suspended solids, total nitrogen, phosphates, carbon and silicates.

The term 'beaver fever' is a misnomer coined by the American press in the 1970s, following findings that the parasite, which causes, is carried by beavers. However, further research has shown that many animals and birds carry this parasite, and the major source of water contamination is by other humans. Norway has many beavers but has not historically had giardia, and New Zealand has giardia but no beaver. Recent concerns point to domestic animals as a significant vector of giardia, with young calves in dairy herds testing as high as 100% positive for giardia. In addition, fecal coliform and streptococci bacteria excreted into streams by grazing cattle have been shown to be reduced by beaver ponds, where the bacteria are trapped in bottom sediments.

Urban beavers in United States Beavers were trapped to near and had not been seen in New York City since the early 1800s. After 200 years, a beaver has returned to New York City, making its home along the. In Chicago, several beavers have returned and made a home near the 's North Pond. The ' has not been as well received by the and the Conservancy, which was concerned over damage to trees in the area. In March 2009, they hired an exterminator to remove a beaver family using live traps, and accidentally killed the mother when she got caught in a snare and drowned. Outside San Francisco, in downtown, a male and female beaver arrived in in 2006.

The built a dam 30 feet wide and at one time 6 feet high, and chewed through half the willows and other creekside landscaping the city planted as part of its $9.7 million 1999 flood-improvement project. When the city council wanted to remove the beavers because of fears of flooding, local residents organized to protect them, forming an organization called 'Worth a Dam'. As an introduced non-native species. Beaver damage on the north shore of Robalo Lake,, Chile In the 1940s, beavers were brought from northern Manitoba in Canada to the island of in southern and, for commercial fur production. However, the project failed and the beavers, ten pairs, were released into the wild.

Having no natural predators in their new environment, they quickly spread throughout the island, and to other islands in the region, reaching a number of 100,000 individuals within just 50 years. They are now considered a serious in the region, due to their massive destruction of forest trees, and efforts are being made for their eradication. The drastically different ecosystem has led to substantial 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 salt water to islands northward; a possible encroachment on the mainland has naturalists highly concerned.

In contrast, areas with introduced beaver were associated with increased populations of native fish ( Galaxias maculatus), whereas the exotic ( Salvelinus fontinalis) and ( Oncorhynchus mykiss) had negative effects on native stream fishes in the, Chile. Beavers are classed as a 'prohibited new organism' under New Zealand's, preventing them from legally being imported into the country.

Social behavior Family life. A beaver pair The basic units of beaver social organization are families consisting of an adult male and adult female in a monogamous pair and their kits and yearlings.

Beaver families can have as many as ten members in addition to the monogamous pair. Groups this size or close to this size build more lodges to live in while smaller families usually need only one. However, large families in the Northern Hemisphere have been recorded living in one lodge.

Beaver pairs mate for life; however, if a beaver's mate dies, it will partner with another one. Extra-pair copulations also occur. In addition to being monogamous, both the male and female take part in raising offspring. Autodesk 3ds Max 2011 64 Bit Crack Download there. They also both mark and defend the territory and build and repair the dam and lodge. When young are born, they spend their first month in the lodge and their mother is the primary caretaker while their father maintains the territory. In the time after they leave the lodge for the first time, yearlings will help their parents build food caches in the fall and repair dams and lodges. Still, adults do the majority of the work and young beavers help their parents for reasons based on natural selection rather than kin selection.

They are dependent on them for food and for learning life skills. Young beavers spend most of their time playing but also copy their parents' behavior. However, while copying behavior helps imprint life skills in young beavers, it is not necessarily immediately beneficial for parents as the young beaver do not perform the tasks as well as the parents. Older offspring, which are around two years old, may also live in families and help their parents. In addition to helping build food caches and repairing the dam, two-year-olds will also help in feeding, grooming and guarding younger offspring. Beavers also practice, in which an older sibling may take over the parenting duties if the original parents die or are otherwise separated from them. This behavior is common and is seen in many other animal species, such as the elephant and.

While these helping two-year-olds help increase the chance of survival for younger offspring, they are not essential for the family, and two-year-olds only stay and help their families if there is a shortage of resources in times of food shortage, high population density, or drought. When beavers leave their natal territories, they usually do not settle far. Beavers can recognize their kin by detecting differences in anal gland secretion composition using their keen sense of smell. Related beavers share more features in their anal gland secretion profile than unrelated beavers. Being able to recognize kin is important for beaver social behavior, and it causes more tolerant behavior among neighboring beavers. Territories and spacing.

Beaver and its dam, Alaska Beavers maintain and defend territories, which are areas for feeding, nesting and mating. They invest much energy in their territories, building their dams and becoming familiar with the area. Beavers mark their territories by constructing scent mounts made of mud, debris and castoreum, a urine based substance excreted through the beavers between the pelvis and base of the tail. These scent mounts are established on the border of the territory.

Once a beaver detects another scent in its territory, finding the intruder takes priority, even over food. Because they invest so much energy in their territories, beavers are intolerant of intruders and the holder of the territory is more likely to escalate an aggressive encounter. These encounters are often violent. To avoid such situations, a beaver marks its territory with as many scent mounds as possible, signaling to intruders that the territory holder has enough energy to maintain its territory and is thus able to put up a good defense.

As such, territories with more scent mounts are avoided more often than ones with fewer mounts. Scent marking increases in August during the dispersal of yearlings, in an attempt to prevent them from intruding on territories.

Beavers also exhibit a behavior known as the '. A territory-holding beaver will investigate and become familiar with the scents of its neighbors. As such they respond less aggressively to intrusions by their territorial neighbours than those made by non-territorial floaters or 'strangers'.

Occurrences of beaver aggression, however, have been reported. In April 2013, an, near Minkovichi in the of, died after being bitten twice on the leg by a wild Eurasian beaver.

Commercial uses. Beaver hunt from a medieval bestiary. The beaver at the bottom is about to bite his own testicles off. The beaver at the top, having already lost his, scarpers off with an anguished expression. Bodley 764, Folio 14r (c.

Both beaver and, a bitter-tasting secretion with a slightly fetid odor contained in the castor sacs of male or female beaver, have been articles of trade for use in traditional medicine. Medicine used dried beaver testicles like willow bark to relieve pain. Dried beaver testicles were also used as contraception. Beaver testicles were used as medicine in Iraq and Iran during the tenth to nineteenth century. 's Fables comically describes beavers chewing off their testicles to preserve themselves from hunters, which is not possible because the beaver's testicles are inside its body.

This belief, also recorded by, persisted in medieval. European beavers ( ) were eventually hunted nearly to extinction in part for the production of castoreum, which was used as an,, and. Castoreum was described in the 1911 for use in and conditions (i.e. Pertaining to the womb), for raising and increasing. The activity of castoreum has been credited to the accumulation of from willow trees in the beaver's diet, which is transformed to and has an action very similar to aspirin. Castoreum continues to be used in perfume production.

Castoreum can be used as an enhancer of vanilla, strawberry and raspberry flavorings. It is sometimes added to frozen dairy, gelatins, candy, and fruit beverages. Due to the difficulty and expense in obtaining castoreum, it is only very rarely used in common food products. Much of the early European exploration and trade of Canada was based on the quest for beaver. The most valuable part of the beaver is its inner fur whose many minute barbs make it excellent for, especially for hats.

In Canada a 'made beaver' or castor gras that a had worn or slept on was more valuable than a fresh skin since this tended to wear off the outer guard hairs. Fur trade museum beaver pelt Beavers have been for millennia, and this continues to this day. Beaver were used for by in the 17th century to gain European goods. They were then shipped back to Great Britain and France where they were made into clothing items. Widespread hunting and trapping of beavers led to their. Eventually, the declined due to decreasing demand in Europe and the takeover of trapping grounds to support the growing agriculture sector.

A small resurgence in beaver trapping has occurred in some areas where there is an over-population of beaver; trapping is done when the fur is of value, and the remainder of the animal may be used as feed. Keygen Zeta Producer 11. In the 1976/1977 season, 500,000 beaver pelts were harvested in North America. Beavers on a map of the valley c. 1635 In wider culture, the beaver is famed for its industriousness and its building skills. The English verb 'to beaver' means to work hard and constantly.

Or Beverley, a placename found at various locations in the English-speaking world and also commonly used as a first name, derives from, combining the words befer ('beaver') and leah ('clearing'). The show features Toothy and Handy who are beavers. The animated Nickelodeon show features Daggett and Norbert. The anthropomorphic have an important role in the plot of, first part of ' The Chronicles of Narnia.

The first book features an unnamed beaver who helps Constance the badger build a bow, the only one ever seen before the books shifted to focus on animals commonly native to the English Isles. As a national emblem The importance of the beaver in the development of Canada through the fur trade led to its official designation as the in 1975. The animal has long been associated with Canada, appearing on the coat of arms of the in 1678.

It is depicted on the and was on the first pictorial postage stamp issued in the in 1849 (the so-called '). As a, the beaver was chosen to be the mascot of the held in with the name ' ('beaver' in ). The beaver is also the symbol of many units and organizations within the, such as on the cap badges of the, the, the and the.,, and bear the beaver on their crest or coat of arms. Others who have used the beaver in their company or organizational symbol or as their mascot include. • • energy drink • • •, East Riding of Yorkshire, UK •, a chain of in • • • • • • (Battle Creek, Michigan) • • The • • Society of Off-Campus Students • • New York City • • retail company • • The State of New York • The State of • The Faculty of Engineering • The • • In dietary law In the 17th century, based on a question raised by the, the Roman Catholic Church ruled that the beaver was a fish (beaver flesh was a part of the indigenous peoples' diet, prior to the Europeans' arrival ) for purposes of dietary law. Therefore, the general prohibition on the consumption of meat on Fridays did not apply to beaver meat.

The legal basis for the decision probably rests with the of, which bases animal classification as much on habit as anatomy. This is similar to the Church's classification of other semi-aquatic rodents, such as the and.