"Behavior of mice aboard the International Space Station
20 female mice were transported to the International Space Station by SpaceX CRS-4 Dragon spacecraft. On NASA’s Rodent Habitat, the mice engaged in a full range of species-typical behaviors. After 7–10 days, younger mice began to exhibit distinctive circling or ‘race-tracking’ behavior that evolved into coordinated group activity. This activity may represent stereotyped motor behavior, rewarding effects of physical exercise, or vestibular sensation produced via self-motion..."