The best-known rat species are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). This group, generally known as the Old World rats or true rats, originated in Asia. Rats are bigger than most Old World mice, which are their relatives, but seldom weigh over 500 grams (17+1⁄2 oz) in the wild. [2]

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2022年5月13日 · The most common type of rat you’ll find in your home is the Brown rat (Rattus norvegicus). It’s also known as the Norway rat, Hanover rat, Parisian rat, or the Wharf rat. These rats have brown hair on their backs, with gray fur underneath. Their tails are long and almost naked, and they have small ears. Features of a Brown Rat

Download scientific diagram | Rat skull. (A) Top (left) and lateral (right) views of the rat skull with main tag points such as bregma and lambda.

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The top rat may groom the supine rat's belly (see also belly-groom, or "power groom"), perhaps as an attempt to gain access to the nape or rump. Rolling on one's back tends to prevent further attack for several reasons: play fighting is directed at the nape, and serious offensive bites are directed at the lower back and flanks, so a roll hides ...

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