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Beavers do not necessarily use the same trees as construction material and as food. Inedible material is more likely to be used as the cap of a beaver family's food cache, the upper part which is frozen in the ice, while the cache itself is composed of edible, high quality branches, which remain unfrozen and accessible. [42]
Dam construction begins in late summer or early fall, and they repair them whenever needed. Beavers can cut down trees up to 15 cm (5.9 in) wide in less than 50 minutes. Thicker trees, at 25 cm (9.8 in) wide or more, may not fall for hours. [56] When chewing down a tree, beavers switch between biting with the left and right side of the mouth.
Beavers make their way through the city by traversing the city's waterways. The city of Toronto government, and the Toronto and Region Conservation Authority (TRCA) do not keep track of the number of beavers residing in Toronto, [81] although an estimate from 2001 places the local beaver population at several hundred. [80]
Beavers eat sagebrush and bark from certain tree varieties, as well as twigs, roots, leaves, and vines. Interestingly, they use different woods to build dams , so they aren't eating the same wood ...
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Trees approaching a diameter of 90 centimetres (3.0 ft) may be used to construct a dam, although the average is 10 to 30 centimetres (3.9 to 11.8 in). Log length depends on the diameter of the tree and the size of the beaver. There are recorded cases of beavers felling trees of 45 metres (148 ft) tall and 115 centimetres (45 in) in diameter.
For years, beavers have been treated as an annoyance for chewing down trees and shrubs and blocking up streams, leading to flooding in neighborhoods and farms. California recently changed its tune ...
They most frequently attack pine, birch, maple, spruce and fruit trees and do the most damage during breeding season and territory establishment between February and June. [11] Beavers girdle the bases of stems 3-6 inches in diameter, and girdle the roots of larger trees. This often weakens or kills trees.