One type of medical research involves ascertaining whether certain pathological conditions in humans can be alleviated or cured by certain drugs. Ani… - Deborah Mayo

Rats and mice, for example, tend spontaneously to develop a high incidence of tumors. This renders them unsuitable for detecting tumors. Still, no animals are used as often as rats and mice for assessing the effect of numerous experimental treatments upon the production of tumors. The reason is that they are inexpensive and take up little room.

Arguments to the effect that it is wrong to cause pain and suffering to animals are often rejected by claiming that animals simply do not suffer. … Ironically, it is precisely upon the assumption that animals do suffer from stress, fear, and pain in a manner similar to humans that the validity of much of animal experimentation rests. Few, if any, conditions are studied as widely in animals as are pain, stress, ulcers, fear, and anxiety.

The error in depicting critics of animal experiments as anti-science becomes clear when one begins to question the extent to which the purported scientific aims of these experiments are actually accomplished. For then it turns out that the experiments and not their critics are unscientific.