
Norwegians will be happy to know that the basic urban rat, known as the Rattus Norvegicus, is not, actually from Norway. It is said that the rats, originally from northern China, were stowaways on Norwegian ships and emigrated to Europe in the 18th century. They also used other methods of transportation to migrate such as trains and automobiles and have even resorted to swimming; in one particular case a large contingency swam across the Volga river to Russia.
In the past week I've seen two rats. A few days ago one hurried past me as I was coming out of Marks & Spencers. Today my cat was chasing (unsuccessfully) a rat outside. For all city dwellers, encountering a rat is a normal occurrence. Who hasn't seen rats scuttling down the tracks in the New York city subway? When you take out the garbage in Rome at night there are rats lurking around the bins like derelict teenagers. In Paris a friend had strapping rats scaling the wisteria plant that grew up the wall of her building. And some of us will never, ever, forget the story of Pete, the rat and the glue trap in New York. He may write about it someday.
Norwegian rats are apparently perfectly suited to city living as a result of their "opportunistic and omnivorous behavior".
Furthermore, "to know the rat is to know its habitat, and to know the habitat of the rat is to know the city" says Robert Sullivan in his 2004 book on New York City rats, Rats: Observations on the History and Habitat of the City's Most Unwanted Inhabitants.
Do you know your rat's habitat?