The agency is cutting animal testing of chemicals. Some scientists are concerned, but in the meantime the rats (and zebra fish) need new homes.

In Dr. Sergiu Pașca's research lab at Stanford University, the resident rats have clumps of human cells in their brains. Blow on a rat's whiskers and the human cells on the opposite side of its ...

Rats in Hein's lab at the University of Wisconsin-Green Bay. Richard Hein Rat studies 101 — When Hein first designed his freshman and sophomore biology classes in 2002, he knew he wanted to ...

While rats would never encounter such "rodent-operated vehicles" in the wild, the ones in Lambert's lab didn't just take to the training itself — they actually seemed to be really into it.

Members of Congress exploded Thursday over reports that taxpayer money has paid for experiments using "transgender lab rats," saying it was time to shut down the government's animal-testing industry.