Why lab rats don't make good crystal balls

"I think animal testing is a terrible idea; they get all nervous and give the wrong answers."--anonymous.
Oh, there's also this:

"Pregnant women may unknowingly be putting their unborn children at risk of birth defects by taking over-the-counter medications and prescription drugs, and using common household chemicals, according to a new study published in the May issue of the research journal, Biogenic Amines.
“The Future of Teratology Is In Vitro” shows that many common drugs and household chemicals have been certified as safe for humans on the basis of animal tests that are accurate on average slightly more than half the time.
Potential teratogens-drugs and chemicals that can cause birth defects during pregnancy-are tested on animals, including mice, rabbits, dogs, and monkeys. None of these animal tests can accurately predict how the substances will affect humans, said Dr. Bailey. “There are simply too many differences in physiology and biochemistry,” he noted.