The first time you see a rat boggling its eyes, it can be a startling sight. Their eyeballs visibly vibrate in their sockets.

These underground rodents are the first mammals found to actively choose air with lower-than-normal oxygen levels. Their ...

The incredible tale of an unlikely pair of best friends. — -- Behold, the incredible tale of Peanut the rat and Ranj the cat, an unlikely pair of best friends. The little rat and orange tabby cat ...

A rat king displayed at the University of Tartu Natural History Museum in Estonia. Some have claimed that the phenomenon in which rats become entangled by their tails is just a hoax but experts say ...