> In the late 1960s, US scientist John B Calhoun created a ‘Mouse Utopia’ – an artificial environment which provided what he regarded as the perfect breeding conditions. To everyone’s amazement, and without any signs of disease or hardship; **after a few months of rapid population growth**, the mouse colony ceased to reproduce at all; and soon became extinct – every single mouse dying within three years.
Biggest question: Since the conditions were not changed, and the population was growing while low, why did it not grow again after the deaths shrank it back to the starting size?
In: Biology
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