Large rat populations can have a damaging effect on cities. Researchers found that living with rats " impacts people and their psyche."

A new study finds that rat infestation in many of the world's cities appears to be soaring, especially in Washington.

As CBS News New York's Vanessa Murdock reports, the Big Apple isn't the only city struggling with this problem.

A new study found that the warming climate may be partially responsible for Boston’s increasing rat population.

Cities experiencing warmer temperatures, fewer green spaces and denser human populations are seeing a rise in rat numbers, a recent study shows. What the study says: ・Jonathan Richardson, a biology professor at the University of Richmond,