Several feeding studies were conducted on rats starting in the 1950s.

This was found through a series of stress tests on rats.

In the 1890s, studies were done on rats, before this hypothesis was put forward.

Research on rats and other mammals had revealed similar patterns.

He has tried his experiment on rats, but the effects are disastrous.

"But they have the same effect on rats as humans, right?"

As days went by the troops ran out of provisions and had to survive on rats.

I read up on rats and got into their psychology.

Other studies with these waves have been done on rats as well.

He looked like a terrorist who had been surviving on rats.