A house rat is the most common in most parts of the world! They can adapt quickly to any surroundings and rapidly breed. A female rat can have and average of 6 offsprings every three weeks. That's 72 rats in a year!
That's why it is always important to manage/control rats since the micro droplets of their urine can cause allergies and diseases like Leptospirosis. Always guard your home and areas from these filthy rats by cleaning your surroundings on a regular basis and pest control solutions.