Calhoun devised his ultimate research experiment. In Universe 25, a population of mice would grow within a 2.7-square-meter enclosure consisting of four pens, 256 living compartments and 16 burrows that led to food and water supplies.... the overall enclosure was built for a capacity of 3,000
With a plague-free environment, a plenitude of comforts, a lack of predation and an unlimited supply of consumables, the mice would enjoy all the luxuries equivalent to modern human life. Calhoun initiated the experiment with four pairs of healthy mice, which were set loose into the enclosure to begin the new society.
During the first 104 days — a phase Calhoun dubbed the "strive period" — the mice adjusted to their new surroundings, marked their territory and began nesting. This was followed by the "exploit period," which saw the population double every 55 days. By the 315th day, Universe 25 contained 620 mice.
By Day 315, behavior disparities between males of high and low status became more pronounced. ... The alpha males, by contrast, became more aggressive and pugnacious, often launching into violence with no clear provocation or motive.... In several instances, bloodbaths ended with a cannibalistic feast for the victors...
By the 560th day, the population increase had ceased altogether as the mortality rate hovered at 100 percent.
Gradually, the mice that refused to mate or engage in society came to outnumber those that formed gangs, raped and plundered, and fed off their own. The last known conception in Universe 25 occurred on Day 920, at which point the population was capped at 2,200, well short of the enclosure's 3,000 capacity.
An endless supply of food, water and other resources were still there for the mice, but it didn't matter. The behavior sink had set in, and there was no stopping Universe 25 from careening to its self-made demise. Soon enough, there was not a single living mouse left in the enclosure..
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Rodent Utopia Universe 25