The brown rat, common rat, street rat, sewer rat, Hanover rat, Norway rat, brown Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.

One of the largest muroids, it is a brown or grey rodent with a body up to 25 cm (10 in) long, and a similar tail length; the male weighs on average 350 g (12 oz) and the female 250 g (9 oz). Thought to have originated in northern China, this rodent has now spread to all continents except Antarctica, and is the dominant rat in Europe and much of North AmericaŚmaking it the most successful mammal on the planet after humans.  For more information see the BBC or Wikipedia.

Photograph taken by Joel Katzen on 14 June 2012 at the Jardins de la Part-Dieu railway station in Lyon, France.

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Last updated Thursday April 24, 2014