Word: norvegicus
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Dates: during 2000-2009
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...only species of rat (of the four-legged variety, anyway) that lives in New York City is the Rattus norvegicus, also known as the Norway rat or the brown rat. Nobody knows exactly how many live here, but everyone agrees that the population has exploded in recent years - thanks to warmer winters, ever more wasteful food habits and, in part, the city's crippling fiscal problems in the 1970s...