Members of Congress exploded Thursday over reports that taxpayer money has paid for experiments using “transgender lab rats,” ...

A laboratory rat or lab rat is a brown rat of the subspecies Rattus norvegicus domestica which is bred and kept for scientific research. While less commonly used for research than mice, rats have ...

We purchased a batch of 40 adult Long-Evans male rats (300–350 g body weight) from a laboratory animal supplier for studies on sexual behavior. We kept the males in pairs in shoebox cages in a ...