"Universe 25 Mouse Experiment" by J. Calhoun shows this too. https://youtu.be/7ReBJfxHjFU https://youtu.be/7ReBJfxHjFU Key sentences (1:30): "Young ones found

"Universe 25 Mouse Experiment" by J. Calhoun shows this too. https://youtu.be/7ReBJfxHjFU https://youtu.be/7ReBJfxHjFU Key sentences (1:30): "Young ones found themselves born in a world with far more mice than meaningful social roles. Males faced a lot of competitors to defend their territory against. Many found that so stressful they gave up. Normal discourse within the community broke down and with it the ability of mice to form social bonds." Very nicely illustrated.