The US Centers for Disease Control and Prevention has warned of “unusual or aggressive” behavior in American rats as a consequence of more than two months of human lockdown for city-dwelling rodents who now find themselves unable to dine out on restaurant waste, street garbage and other food sources. Last month, according to the national health body, dumpster-diving rats were observed resorting to eating their young in the wake of urban shutdowns. “Community-wide closures have led to a