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The American Beaver
(C. canadensis) is the national animal of Canada; it is depicted
on the Canadian five-cent piece and was on the first Canadian
postage stamp, the Three Penny Beaver. However, in several areas
of that country, it is considered a pest. It is also the state
animal of Oregon, the state mammal of New York (after the historical
emblem of New Netherland) and the mascot of Oregon State University.
It is also a common school emblem for engineering schools, including
the California Institute of Technology and the Massachusetts Institute
of Technology.
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The dams are
created both as a protection against predators and to provide
easy access to food during winter. It is the sound of water in
motion that stimulates the beavers to build, and if for example
a pipe is placed under the dam to drain it the beavers will not
do anything about it. However they repair any damage to the dam
and build it higher as long as the sound is there. Conversely,
beavers will attempt to build dams in response to recordings of
water flowing even in the absence of water. The ponds created
by well-maintained dams help isolate the beavers' home, their
lodge, also created from severed branches and other natural sources.
The lodge has an underwater entrance to make entry nearly impossible
for any other animal. Destroying a beaver dam without removing
the beavers takes a lot of effort.
Above Images Come From The Us Fish and Wildlife Service
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