A typical adult black rat is 12.75 to 18.25 cm (5.02â7.19 in) long, including a 6.5 to 10 cm (2.6â3.9 in) tail, and weighs 110 to 340 g (4â12 oz). Despite its name, the black rat exhibits several colour forms.It is usually black to light brown in colour with a lighter underside.lack rats adapt to a wide range of habitats. In urban areas they are found around warehouses, residential buildings, and other human settlements. They are also found in agricultural areas, such as in barns and crop fields.
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The queen can get pregnant again as early as one to two weeks after giving birth, so it is advisable to get her neutered promptlyâ¢ The kittens should be neutered around four months of age. If neutering is not carried out by then, males should be separated from females and the queen â to prevent in-breeding.