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The muskrat is much smaller than a beaver (Castor canadensis), with which they often share a habitat. [6] [7] Muskrats are covered with short, thick fur, which is medium to dark brown or black, with the belly a bit lighter (countershaded); as the animal ages, it turns partly gray. The fur has two layers, which protect it from cold water.
[47] [48] They either construct their own burrows, or occupy burrows abandoned by beaver, muskrats, or other animals. [10] They are also capable of constructing floating rafts out of vegetation. [10] Nutria live in partially underwater dens. The main chamber is not submerged underground. Nutria are considered to be a species that lives in colonies.
A beaver's lips can close behind the incisors, preventing water from entering their mouths as they cut and bite onto things while submerged. [30] [31] The fore foot, hind foot, and tail of a beaver Beaver tail and footprints on snow. The beaver's front feet are dexterous, allowing them to grasp and manipulate objects and food, as well as dig.
The round-tailed muskrat is a semiaquatic and nocturnal species native to the southeastern United States. [3] Limited sexual dimorphism is seen among round-tailed muskrats, with female adults weighing an average of 262 grams (9.2 oz) and male adults measuring at a slightly heavier average of 279 grams (9.8 oz). [3]
A beaver is featured prominently on the stamp and seal issued to Professional Engineers and Geoscientists by APEGA. It also appears on the back on the state flag of Oregon. The beaver also appears in the coats of arms of the Hudson's Bay Company, [108] University of Toronto, Wilfrid Laurier University, and the London School of Economics.
North American beaver: Castor canadensis: Extant: 50 kg (110 lb) 5: Lesser capybara: Hydrochoerus isthmius: Extant: 45.4 kg (100 lb) 6: Eurasian beaver: Castor fiber: Extant: 40 kg (88 lb) 7: Cape porcupine: Hystrix africaeaustralis : Extant: 30 kg (66 lb) 8: Crested porcupine: Hystrix cristata : Extant: 27 kg (60 lb) 9: North American ...
The Eurasian beaver (Castor fiber) or European beaver is a species of beaver widespread across Eurasia, with a rapidly increasing population of at least 1.5 million in 2020. The Eurasian beaver was hunted to near-extinction for both its fur and castoreum , with only about 1,200 beavers in eight relict populations from France to Mongolia in the ...
It resembles beaver, with stiff guard hairs and a soft, short undercoat. [ 2 ] It was originally imported to the southern United States – possibly as early as the 19th century, although in larger numbers from the 1950s – to reduce the population of muskrat .