Mouse Utopia Experiment July 1968, ethologist John B. Calhoun built a “mouse utopia,” a metal enclosure 9 feet square with unlimited food, water, and nesting material. He introduced four pairs of mice, and within a year they had multiplied to 620. But after that the society began to fall apart.Males became aggressive, females began neglecting the young, and weaker mice were crowded to the center of the pen, where resources were scarce. After 600 days females stopped reproducing, the males withdrew from them entirely, and by January 1973 the whole colony was dead. The last generation 🐁's were called "the beautifull ones".
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