Cold snap chills New York City's rats, and heats up the fight against them
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This week's frigid weather has many New York City residents shivering, scurrying into cozy spots and feeling sapped. Including the rats. The United States' most populous city has been spared the Upper Midwest's extreme wind chills, not to mention the shock of record-breaking snow in the deep South, in this week's Arctic blast. But temperatures peaked Monday around 26 degrees Fahrenheit (-3 Celsius) and roughly 20 degrees (-7 Celsius) Tuesday and Wednesday, well below average.
Such cold has, yes, a chilling effect on the Big Apple's notorious rodents. But it boosts efforts to get rid of them, says city “rat czar” Kathleen Corradi. “It's stressing out rats. It’s putting them in their burrows,” she says. “So we kind of get to double down now while the rats are ‘feeling the heat’ from this cold snap.”.
New York City's wild rat species — Rattus norvegicus, also called the Norway rat or brown rat — doesn't hibernate in winter but does become less active when the weather is freezing for prolonged periods. At the same time, the rodent's food source tends to shrivel because people are out less and therefore discarding few food wrappers and other rat snacks on the streets, Corradi said.
All that makes for stressed rats and suppresses breeding, which “is really their superpower,” Corradi said. Norway rats can reproduce many times a year, essentially any time conditions are suitable, though they tend to be most prolific from spring through fall.
