The common rat is hideous thing to behold. Two species make up what we call the true rat: the black rat Rattus rattus, and the wharf rat Rattus norvegicus. On the whole of the Earth, the only places where rats do not find a home are the forbiddingly cold Arctic and Antarctic regions, some miscellaneous islands where they haven’t gained a foothold, a wildlife preserve in New Zealand, and Alberta Canada where a concerted effort of riled Canadians will massacre rodents upon a hint that a rat may have infested the province.
Historically the rat has been labeled a pest and more-than-a-nuisance due to their capacity to carry diseases that can infect humans, and their propensity to reproduce like… well… uh… rodents. However, in this wonderfully modern time in which we live the rat is being put to task by their human overlords doing much more productive things. (Read More at Damn Interesting)