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The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 ...
Rats such as the bandicoot rat (Bandicota bengalensis) are murine rodents related to true rats but are not members of the genus Rattus. [4] [5] Male rats are called bucks; unmated females, does, pregnant or parent females, dams; and infants, kittens or pups. A group of rats is referred to as a mischief. [6]
The entire rat populations of several islands have been eradicated, most notably New Zealand's Campbell Island, [26] Hawadax Island, Alaska (formerly known as Rat Island), [27] Macquarie Island [28] and Canna, Scotland (declared rat-free in 2008). [29] According to the Friends of South Georgia Island, all of the rats have been eliminated from ...
Individual rats would rarely eat except in the company of other rats. As a result extreme population densities developed in the pen adopted for eating, leaving the others with sparse populations. In the experiments in which the behavioral sink developed, infant mortality ran as high as 96 percent among the most disoriented groups in the population.
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 2025. Order of mammals Rodent Temporal range: Late Paleocene – recent PreꞒ Ꞓ O S D C P T J K Pg N Capybara Springhare Golden-mantled ground squirrel North American beaver House mouse Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Mirorder ...
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.
Infection with Toxoplasma gondii has been shown to alter the behavior of mice and rats in ways thought to increase the rodents’ chances of being preyed upon by cats. [ 31 ] [ 32 ] Infected rodents show a reduction in their innate aversion to cat odors; while uninfected mice and rats will generally avoid areas marked with cat urine or with cat ...
The desert kangaroo rat (Dipodomys deserti) is a rodent species in the family Heteromyidae that is found in desert areas of southwestern North America. [2] It is one of the large kangaroo rats, with a total length greater than 12 inches (300 mm) and a mass greater than 3.2 ounces (91 g).