RAT SPECIES

Two main types of rats cause concern in the United Kingdom. The Brown Rat (common rat) and the Black Rat (sewer rat) are commonly found in private homes and business property.

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Black Rat

(Rattus rattus)

Black rats can be found in coastal towns and many urban environments across the United Kingdom.

Black rat

Appearance

  • The black rat is between 16–24cm in length, with a tail longer than the head and body.
  • It grows to between 150–200g in weight.
  • They have a pointed nose, large ears and a slender body.

Lifecycle

  • Black rats produce 5–10 young per litter and have between 3–6 litters a year.
  • The gestation period is about three weeks.
  • It only takes between 12–16 weeks from birth for them to reach sexual maturity.

Habits

  • They are incredibly agile and excellent climbers.
  • Their preferred food is moist fruits. Black Rats will eat around 15g of food a day and drink 15ml.

Brown Rat

(Rattus norvegicus)

Brown rats usually prefer ground living and burrowing, but sometimes they can be known to climb.

Brown rat

Appearance

  • The brown rat is up to 40 cm in length, with a tail shorter than the head and body.
  • It grows up to between 350–500g in weight.
  • It has a blunt nose, small ears and a thicker body compared to the Black Rat (Rattus rattus).

Lifecycle

  • Rats have 7–8 young per litter and between 3–6 litters a year.
  • The gestation period is about three weeks.
  • It only takes 10–12 weeks from birth to reach sexual maturity.

Habits

  • Preferred food is cereals, although they are omnivorous.
  • They will eat around 30g of food a day and drink 60ml.