Brown rats are burrowing animals that are widest at the skull, so they can slip into any space wider than that (including the pipe leading to a toilet bowl). Corrigan points out a small hole ...

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 ...

The brown rat, the R. norvegicus ... They worked in pairs. A small rat would straddle an egg and clutch it in his four paws. When he got a good grip on it, he’d roll over on his back.

The answer to the latter, it became clear, was much more than a T-shirt. The brown rat, or Rattus norvegicus, isn't all that different from the average New Yorker. It hates long commutes and loves ...

Of the 101 brown rats from Chicago alleys tested in the study, 74% tested positive to at least one AR compound and 32% were exposed to multiple AR compounds. Of the 93 sampled mesopredators ...