Animal experiments using mammals are essential to the study on the mechanisms of phenomena produced in the human body in the space environment.

The animal experiments have contributed to the physiology and medicine concerned with the care and cure of patients as well as with an understanding of mechanisms of various diseases and human health. In particular, the numerous mammals have been used for the medical researches. Similarly, to investigate the phenomena in the human body that occur in the space environment, the various mammals have been used for the medical researches in space. Since the human with frontier spirits will never stop continuing the space development and utilization, the space medical and physiological researches using mammals as well as subjects are more important and necessary for the future space activities. The mammal modules in spacecrafts and space station are produced for the rodents at this time. Therefore, from various viewpoints, the rats and mice are the first choice for space mammal experiments of medical or life science researches and space modules for the mammal should be carefully and extensively designed.