Dr. Snyder did not include female rats in the study to see if a similar reaction occurred.

The group includes true mice and rats, gerbils, and relatives.

Subjects often include rats, apes, policemen, soldiers, children, and the elderly.

It also included live rats running through part of the exhibit.

Major threats include rats, pigs, deer, competition with introduced species of plants, and wildfire.

Threats have included rats, cats, other predators, and the nearby energy production facility.

A few of these species included rats, cats, turtles, cows, and chickens.

Animals used as models for schizophrenia include rats, mice, and primates.

Certainly, wildlife in the park includes also pigeons, squirrels and rats.

The bones in the hearth included snakes, rats, fish, rabbits, and other small animals, which showed that people used everything possibly available.