Brown rat, known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat, Norwegian rat and Parisian rat, is a widespread species of common rat.
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Selective breeding of the brown rat has produced the fancy rat, as well as the laboratory rat .
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Against this hypothesis stands the fact that when the brown rat had become common in this country, it was unknown in Norway, although there was a small animal like a rat, but really a lemming, which made its home there.
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Brown rat is the species common in England, and best known throughout the world.
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The brown rat is a rather large murid and can weigh twice as much as a black rat and many times more than a house mouse .
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Brown rat is nocturnal and is a good swimmer, both on the surface and underwater, and has been observed climbing slim round metal poles several feet in order to reach garden bird feeders.
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Brown rat is a true omnivore and will consume almost anything, but cereals form a substantial part of its diet.
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Possibly originating from the plains of northern China and Mongolia, the brown rat spread to other parts of the world sometime in the Middle Ages.
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In tropical and desert regions, brown rat occurrence tends to be limited to human-modified habitats.
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Today the brown rat is found on seven of the 18 Faroese islands, and is common in and around human habitations as well as in the wild.
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The first brown rat did not reach Alberta until 1950, and in 1951, the province launched a rat-control program that included shooting, poisoning, and gassing rats, and bulldozing or burning down some rat-infested buildings.
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