https://youtu.be/4C_tt8coNy8
There is a theory that a pair of rats could produce nearly half a billion descendants in just three years, however, the population will always be restricted by food and shelter, disease, natural predation and fighting amongst themselves. But the rapid rate of reproduction amongst rats usually comes as a shock. This is the reason why pest control specialists recommended prevention and identifying the initial signs of a rat problem. News about growing sightings of rats often makes headlines in local TV and newspapers. Climate change, weather and favourable ecological circumstances can often be responsible for rising rat populations. A female rat normally has six litters a year, up wards of 10 rat pups, but 6 pups is more common. Rats reach sexual maturity after 9 weeks, so the population can rise from two rats to around 1,200 in one year, with the possibly to grow exponentially. Rats breeding is characterised as quantity over quality. They create great numbers of offspring on the basis that at least a couple will survive long enough to produce their own litters. With adequate space and food they have the possibility of rapidly exploding in numbers.
gogreenpestcontrol.ca Ladner Tsawwassen Delta B.C. Randy Bilesky
https://www.linkedin.com/pulse/planet-rats-randy-bilesky/?published=t
http://www.delta-optimist.com/opinion/blogs/blog-planet-of-the-rats-1.23065608