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The vision of a pigmented rat is poor, around 20/600, while a non-pigmented (albino) with no melanin in its eyes has both around 20/1200 vision and a terrible scattering of light within its vision.
Brown rats also produce communicative noises capable of being heard by humans.Brown rats dig well, and often excavate extensive burrow systems.A 2007 study found brown rats to possess metacognition, a mental ability previously only found in humans and some primates, Rats may also emit short, high frequency, ultrasonic, socially induced vocalization during rough and tumble play, before receiving morphine, or mating, and when tickled.By the early to middle part of the 19th century, British academics believed that the brown rat was not native to Norway, hypothesizing (incorrectly) that it may have come from Ireland, Gibraltar or across the English Channel with William the Conqueror."Now there is a mystery about the native country of the best known species of rat, the common brown rat.In addition, they commonly squeak along a range of tones from high, abrupt pain squeaks to soft, persistent 'singing' sounds during confrontations.
The brown rat is a true omnivore and will consume almost anything, but cereals form a substantial part of its diet.Adult body weight averages 350 g (12 oz) in males and about 250 g (9 oz) in females.Exceptionally large individuals can reportedly reach 900 to 1,000 g (32 to 35 oz) but are not expected outside of domestic specimens.Brown rats have acute hearing, are sensitive to ultrasound, and possess a very highly developed olfactory sense.Their average heart rate is 300 to 400 beats per minute, with a respiratory rate of around 100 per minute.The Brown rat (Rattus norvegicus), also referred to as the common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, or wharf rat is one of the best known and most common rats.