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Pack rats build complex houses or dens made of twigs, cactus joints, and other materials. These contain several nest chambers, food caches, and debris piles. Dens are often built in small caves or rocky crevices, but when close by human habitations, woodrats will opportunistically move into the attics and walls of houses.
The mathematical basis for this material efficiency involves the calculation of the wall's arc length. Modeled after a sine wave, the length of a crinkle crankle wall is given by the integral ∫ 0 2 π 1 + a 2 cos 2 ( x ) d x {\displaystyle \int _{0}^{2\pi }{\sqrt {1+a^{2}\cos ^{2}(x)}}\,dx} , where ( a ) {\displaystyle (a)} is the ...
A Norway rat can have litters from 6 to 10 young, and can be of adult breeding age in as little as three to four months, according to the Washington state Department of Fish and Wildlife.
Nicknames include "packrats" or "trade rats" because of their tendency to hoard things, build large domed dens, and "trade" by dropping then picking up another object for it. Coyotes and other predators will attempt to prey on these rodents by laying waste to the dens, but the sheer volume of material is usually dissuasive. Occasionally, dusky ...
Unsourced material may be challenged and removed. Find sources: "List of largest rodents" – news · newspapers · books · scholar · JSTOR ( September 2018 ) ( Learn how and when to remove this message )
Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward. A ha-ha (French: hâ-hâ [a a] ⓘ or saut de loup [so də lu] ⓘ), also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier (particularly on one side) while preserving ...
The data shows New Yorkers reported spotting rats on 40 per cent of subway trips in the past month while each station has been ranked in terms of how ratty it is. Transit also asks commuters if ...
Desert woodrats are relatively small for pack rats, measuring 28 to 39 cm (11 to 15 in) in length, including a 12 to 20 cm (4.7 to 7.9 in) tail. They weigh from 122 to 350 g (4.3 to 12.3 oz), with males being larger than females. Their coloring varies between individuals, and can be anything from pale gray to cinnamon to near-black.
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