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John B Calhoun’s famous Universe 25 ‘mouse utopia’ experiment is often cited as demonstrating the problems of overpopulation. However, the utopia’s population peaked at 2200 mice, despite there being room for 3840. What gives?

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John B Calhoun’s famous Universe 25 ‘mouse utopia’ experiment is often cited as demonstrating the problems of overpopulation. However, the utopia’s population peaked at 2200 mice, despite there being room for 3840. What gives?	1