Rats tend to avoid reproducing in cold weather, Jason Munshi-South, a biologist and associate professor at Fordham University, told Insider.
"It's going to be an issue," Munshi-South said, "especially in northern cities like New York City.
Rats on the rise Efforts to control the rat population have highly mixed results.
AdvertisementAdvertisementBy running his own surveys with exterminators around the city, Corrigan concluded, "there are more rats.
In previous years, it would've been cold by then and rats would've stopped reproducing," in NYC, he told Insider.
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