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 ...

Norway rats (Rattus norvegicus), like most species of rat, are very sociable and cooperate to help each other out Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news ...