Currently, there are more than 60 rat species in Australia, but there are two species that are causing concern in the country: the Black Rat (roof rat) and the Brown Rat (common rat). The brown rat has a more blunt nose, smaller ears, but thicker body than the black rat. Both species reproduce rather quickly, reaching sexual maturity 10 – 12 weeks after birth. The black rat (the culprit of the London Bubonic Plague of 1665) is usually found in degraded areas. These are the rodents commonly found in cities and towns, and are the ones infesting houses, sheds, and storages. Aside from the stinky smell and damage to properties, brown and black rats can also carry serious diseases like leptospirosis and typhus fever, carry ticks and fleas that can infect both animals and humans, and contaminate food with their hair, feces, and urine, which can result in food poisoning.