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Norway Rat – Rattus Norvegicus

norwayrat
The Norway Rat is also known as the Rattus Norvegicus and the largest rat in Australia. The Norway Rat is also known by Street Rat, Common Rat, Brown Rat, Wharf Rat Hanover Rat and Norwegian Rat.
Despite the name Norway Rat it is believed that the rat originated from China and spread through Europe except Antarctica and on to Australia in the late 1700s by boat from England.There was a theory on how the Norway Rat in the early 1700s had been imported by a timber cargo ship from Norway to England but this proved wrong as Norway did not have the Norway Rat species in their country at that time but did have a rather smaller rodent called the Lemming.You will find the Norway Rats in highly populated residential areas, warehouses, industrial areas and shipping ports.
Norway Rats have developed a way to utilise human waste and food which makes them one of the smarter rodents that we have in Australia.Norway Rats are very good swimmers both in shallow and deep waters.

norwayrat_map

What Do Norway Rats Look like?

Norway rats are a dark grey to brown colour with their belly often a light grey or brown colour. The Norway Rats fur is coarse and short. In some cases it is known that The Norway Rat can be albino or jet black. Their vision is very poor with around 20/600, Norway Rats have perceive colours and their saturation can be quite faint, they do have blue perception which allows them to see ultraviolet lights that other species are unable to see. Norway Rats rely on their hearing, sense of smell, taste and touch.
norway_rat

Head to Body – 180-255mm
Tail – 150-480mm
Weight 280-320grams
Life Cycle of the NorwayRat
Life Span – 9-18 months
Gestation Period – 21-23 days
Litter Size – 8-10
Number of litters per year – 5 to 6 litters

 

Nesting Behaviours

Norway Rats are known to burrow deep in the ground away from predators; they usually will burrow near a structured wall or object as this will provide the Norway Rat a sturdy roof for its burrow. Each burrow will have multiple tunnels and levels for the Norway Rat colony.

Signs Of An Infestation of Norway Rats
Gnawed Objects Norway Rat will gnaw every day to avoid their teeth growing to a point which is uncomfortable for them, they like to keep their teeth short & sharp. Norway Rats will gnaw through almost any materials.
Droppings & Urine Norway Rats will leave droppings and urine in an area that they favour but can leave droppings and urine almost anywhere. Over a short period of time the droppings and urine will cause a smell. Norway Rats droppings are capsulated and are roughly 6inches long.
Rub Markings Norway Rats will leave a brownish to black smudge along the walls when running from room to room or on garden furniture.
Paths & Runways Norway Rats will always have a path or runway to which they use frequently between their burrow and their food and water source.
Sighting Norway Rats will hide during the day and will not be seen unless there is an infestation of Norway Rats and that they are forced out of their natural hiding spaces.