They found that rats and mice developed a variety of tumors when fed the chemical in doses 50 to 100 times those recommended for humans.

The rat then develops immunity against re-infection.

The rats developed the habit of drinking water during these intervals, but their consumption far exceeded what was expected.

Tolman believed that the rat had developed a cognitive map of his maze, with knowledge of where the food was located.

Currently no mice or rats have developed while in microgravity throughout the entire developmental cycle.

The rats eventually developed a disorder that looked more like mad cow disease than the original human illness.

When deprived of fats, rats do not develop a craving for them, nor will they eat foods that would create an imbalance in their diets.

The rats develop bacterial infections of the blood, as if their immune systems had crashed.

Absent the warnings, however, the rat would develop ulcers.

In animal studies of teriparatide, some rats developed a form of bone cancer called osteosarcoma.