The development and progress of human medicine not only benefit from the hard work of scientists, but also from the silent sacrifice of experimental animals  Before drug development into the clinical, we need to do a lot of animal experiments to explore the efficacy, toxicity, safe dose of drugs  However, there are many differences between human beings and rats, pigs, dogs, rabbits and other animals after all
In the Song Dynasty, Materia Medica Yan Yi recorded that some wild geese with broken wings were fed with natural copper, and then the wild geese flew away. In the eyes of modern people, it is unthinkable to eat natural copper to treat fractures.
 Even if we have a correct understanding of the physiological structure of animals and the law of drug reaction, we can not easily and blindly transfer the result of our understanding to human beings