Pet rats are super intelligent and social animals that really thrive when you give them plenty of mental stimulation and opportunities to explore their surroundings. Keeping your rat entertained is ...

But now, for the first time, scientists have spotted the rat equivalent of a smile—and it’s all in the ears. They found that happy laboratory rats not only can be literally tickled pink ...

Wondering if your pet rat is feeling happy? You should check its ears, researchers say. A team of scientists in Switzerland found that a rat's ears are more pinkish and are positioned at a more ...

Everybody else is doing sloppy bunnies and happy bears ... But when this almost cherubic cartoon rat sings, he added, it’s as if “Aerosmith is seeping out.” Willems, who wrote all ...

But there are plenty of reasons to want to know what a happy rat looks like: In addition to helping scientists monitor lab animal welfare, these cues could help out in studies where positive ...