WASHINGTON (AP) — Rat infestation in many world cities appears to be soaring, especially in Washington, and a new study blames warming temperatures, urbanization and other human actions.

published in the journal Science Advances on Friday, that lays bare the scale of Toronto’s problem. Of the 16 cities analyzed, Toronto had the third-fastest growing rat population.

Copyright 2025 The Associated Press. All Rights Reserved. A rat leaves its burrow at a park in New York City on Sept. 17, 2015. ( AP Photo/Mary Altaffer, File) A rat ...

One thing is certain: They’re everywhere. NEW YORK CITY Adaptable and smart, rats of several species have evolved to thrive in major cities—yet the sight of a rat scurrying across West ...

Based on individual trends within cities, Washington was by far the leader in rat increases, followed by San Francisco, Toronto, New York City and Amsterdam. NBC Universal, Inc. Rat infestation in ...

A rat scurries across West Broadway in New York City. A study looking at rat populations in large cities found that rising temperatures may be helping rat populations grow. Scientists have already ...

The study published by Science Advances on Friday, Jan. 31 analyzed public records from 16 cities worldwide to determine why some urban environments are more infested with rats than others. The ...

Just three saw declines: New Orleans, Louisville and Tokyo. The study linked rat increases to several factors, including high population densities and low amounts of urban vegetation, but the ...

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