Beaver
Beavers are semiaquatic rodents known for their industrious nature, gnawing through tree trunks to collect wood used to build their huge homes – called dams, that can stop the flow of rivers.
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order – Rodentia
Family – Castoridae
Genus - Castor
Species – C. canadensis
Common Name – Beaver, North American Beaver
Beavers are nocturnal, meaning they are mostly active at night. They make large homes in the water out of wood such as sticks and twigs. These homes are called “lodges”. Beavers are also known to create large dams to stop the flow of a river or stream, which causes an artificial pond to form. These ponds are a perfect spot for beaver lodges.
Dams are created with large branches of trees that the beavers gnaw down with their incisors. After damming a river or stream, the beavers will create their lodges in the deep water that forms near the dam. They will build entrances well underwater, which helps them to use lodges to avoid predators that aren’t as good at swimming. The largest beaver dam is over a half mile in length!
Beavers will also eat the plant material from the trees they cut down. They will store food in their lodges to help them get through winter, when the plants they eat become more difficult to find.
Their tails can be used to slap the water’s surface, in order to alert other beavers of a potential threat. Beavers must be vigilant for predators, which include coyotes, wolves, and cougars.
Beavers are large rodents, the largest in the North American continent. They weigh around 40 pounds usually, and can grow to three feet in body length, with the tail adding a foot or more extra length.
They have many adaptations to help them spend most of their time in the water. Their rear feet are webbed, which helps them when swimming, and their most notable feature is a large, flattened tail. The tail is used for fat storage.
They have a special membrane to cover their eyes when underwater, and they are able to seal their nostrils and ears shut to prevent water from getting in while they swim. They have a layer of blubber and a double coat of fur to keep them warm in cold water.
Their front teeth, called incisors, never stop growing. They use these teeth to gnaw trees to use for dam building, and frequent gnawing helps keep their teeth from growing out of control.
The beaver is a national symbol of Canada. It is also the state animal of New York and Oregon. The beaver is a frequent mascot of engineering programs and schools, due to its dam-building prowess.
The North American beaver is a species of Least Concern. It is found on nearly the entirety of the contiguous United States and Canada, with the only exceptions being the extreme north, the extreme southwest, and most of Florida.
However, its range was historically much larger, and it was much more common than it is today. It has historically been hunted and trapped for its fur, which nearly drove the species to extinction.
The beaver is an important “keystone” species, whose behavior has a large effect on its environment, due to the way it shapes its habitat by dam building. It creates new ponds and wetlands in areas where it is found.
References
https://en.wikipedia.org/wiki/North_American_beaver
Macdonald, David W. (editor). (2006). The Princeton Encyclopedia of Mammals. Princeton, New Jersey: Princeton University Press.
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