brown rat

American  

noun

1. Norway rat.

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brown rat British  

noun

1. Also called: Norway rat.  a common brownish rat, Rattus norvegicus : a serious pest in all parts of the world

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Etymology

Origin of brown rat

First recorded in 1820–30

Example Sentences

Puffins have been seen on the Isle of Muck in County Antrim for the first time in years, after a major scheme to remove invasive brown rats.

From BBC

Consider the infamous brown rats of New York City, which have evolved longer noses and shorter upper molar tooth rows, the better to enjoy the Big Apple's colder weather and higher-quality food.

From Salon

According to the RSPCA, there are only two species of rats living in the UK - brown rats and black rats.

From BBC

Although most historical accounts date the arrival of brown rats to about 1775, new evidence suggests this ratty rivalry began much earlier.

From Science Magazine

For instance, brown rats like to hang out on or near the ground rather than in the trees or other high spots, where black rats often prefer to stay.

From Seattle Times