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Castoroides (from Latin castor (beaver) and -oides (like) [2]), or the giant beaver, is an extinct genus of enormous, bear-sized beavers that lived in North America during the Pleistocene. Two species are currently recognized, C. dilophidus in the Southeastern United States and C. ohioensis in most of North America.
The oldest fossil record of beavers in North America are of two beaver teeth near Dayville, Oregon, and are 7 million years old. [30] Subspecies.
Beavers can be found in a number of freshwater habitats, such as rivers, streams, lakes and ponds. They are herbivorous, consuming tree bark, aquatic plants, grasses and sedges. Beavers build dams and lodges using tree branches, vegetation, rocks and mud; they chew down trees for building material. Dams restrict water flow, and lodges serve as ...
The mountain beaver (Aplodontia rufa) [Note 1] is a North American rodent.It is the only living member of its genus, Aplodontia, and family, Aplodontiidae. [2] It should not be confused with true North American and Eurasian beavers, to which it is not closely related; [3] the mountain beaver is instead more closely related to squirrels, although its less-efficient renal system was thought to ...
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 ...
Castoridae is a family of rodents that contains the two living species of beavers and their fossil relatives. A formerly diverse group, only a single genus is extant today, Castor . Two other genera of "giant beavers", Castoroides and Trogontherium , became extinct in the Late Pleistocene .
The trademark sharp front teeth of both species pose a particular danger, as they are long enough to pass through limbs and cause significant bleeding. [ 4 ] At least one beaver attack on a human is known to have been fatal: a 60-year-old fisherman in Belarus died in 2013 after a beaver bit open an artery in his leg. [ 3 ]
It was theorized that positive selection for shovel-shaped incisors over the spatulate incisors is more commonly found within cultures that used their teeth as tools due to a greater structural strength in increased shovel-shaped incisors. [2] In some instances, incisors can present a more pronounced version of this called double shovel-shaped.