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

Rats had ad libitum access to food and water ... to prevent or reduce chronic lung disease in preterm infants. The separate experiments were performed using different groups of male and female ...

An extra month may not sound like much, but female rats can have a litter every month. Each litter is eight to 16 baby rats, Richardson said: “That is a recipe for accelerated population growth.” ...