Species of Rat

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea.

The best-known rat species are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). The group is generally known as the Old World rats or true rats, and originated in Asia. Rats are bigger than most Old World mice, which are their relatives, but seldom weigh over 500 grams (1.1 lb) in the wild.


Black Rat ( Rattus Rattus )

  • Length 16-24cm, 150 to 200gm weight
  • Homes, Commercial, Higher ground
  • Feed on everything (Pet food)
  • 5-10 young per litter, 3-6 litters a year
  • Damages building foundation, electrical wire and water pipe

Brown Rat ( Rattus Norvegicus )

  • Length up to 40cm, 350 to 500gm weight
  • Homes, Commercial, Docks, Sewers
  • Omnivorous, eats 30g drink 60ml
  • 7-8 young per litter, 3-6 litters a year
  • Damages building foundation, roads and irrigation canals

FAQ about Rat

Q.1 How long will my pet rat live?

Ans: The average lifespan of a pet rat is between 2 and 3 years.

Q.2 Is there any difference in disposition between a male and female?

Ans: Both sexes make wonderful pets. Females are smaller and considerably more active than males and their fur is softer. On the other hand, males are normally happier sitting on your lap and having you scratch their head.

Q.3 Why are there rats in my house?

Ans: Rats in your property doesn’t necessarily mean your place is dirty. Rats are attracted to anywhere there is food, water and shelter. Only small holes are required for a rat to squeeze through.

Q.4 Is rat poison dangerous to cats and dogs?

Ans: The short answer is yes, but there are several ways to mitigate the risks.

Q.5 How much do rats and mice eat per day?

Ans: Rats eat approximately 1 oz. of food and mice eat 1/10 oz.


Signs of Rat

Risk of Rat

  • Loss of trust from customers and employees
  • Lost of goods and equipment
  • Failure to comply legislation may result in business closure or fine

Increase in Rat



  • A zoonotic disease caused by bacteria of the genus Leptospira.
  • Most commonly spread via water contaminated with urine from infected animals
  • Contaminated food or soil can also act as vehicles for the disease
  • The main animal reservoirs are rodents, livestock and dogs
  • Disease in humans can vary from mild flu-like illness to serious disease.
  • Severe complications include kidney damage, liver failure, respiratory distress, meningitis and death.


  • Contact with urine (or other body fluids, except saliva) from infected animals.
  • Contact with water, soil, or food contaminated with the urine of infected animals.
  • Outbreaks of leptospirosis are usually caused by exposure to contaminated water, such as floodwaters.


  • High fever
  • Headache
  • Chills
  • Muscle aches
  • Vomiting
  • Jaundice (yellow skin and eyes)
  • Red eyes
  • Abdominal pain
  • Diarrhea
  • Rash


  • Johor has recorded a spike in leptospirosis (rat urine disease) cases with 228 as of this month (Sep 2017) compared with 205 in 2016
  • 68 cases of leptospirosis in Johor in 2012 & 205 cases of leptospirosis in Johor in 2016
  • The symptoms of leptospirosis include stomach ache, flu and fever. If left untreated, it could eventually lead to organ failure and death.