Where is the rat population growing?

Estimated change in rat activity in selected cities. Positive figures represent increasing rat numbers, while negatives represent a decrease.

A bar chart showing the increase/decrease in rat activity in key US cities.

(Please use a modern browser to see the interactive version of this visualization)

Figures represent the "Z" value, a statistical measure used to express the distance between an event and the population mean.

Chart: CHRISTINA PRIGNANO/GLOBE STAFFSource: Science Advances, Vol. 11 issue 5