For six years she studied rats, investigating the effects of stress factors and antidepressants on their libidos.

I just couldn't see myself studying rats for the rest of my life.

Over the years he studied monkeys, apes, reptiles, rats, giraffes, camels and marmosets.

Now researchers studying embryonic rats have identified a molecule that appears to be crucial to understanding how the eye becomes connected to the brain.

Researchers at Yale reached that conclusion after studying rats that were allowed to administer cocaine to themselves.

The researchers studied young rats that were first given the drug, and, in some cases, were later exposed to the widely used insecticide chlorpyrifos.

Dalley's team studied male rats, not people.

Davis began studying rats during World War II.

Unfortunately, this study only demonstrates that the institute seems more interested in studying rats than in living, breathing women.

Scientists at Stanford University recently followed up on these experiments, studying rats and mice.