![]() ![]() ![]() ![]() EquilibriumĪs the population reached its peak, the Equilibrium phase began. The population doubled every 32 days, and the first signs of social stress began to emerge. In the Exploit phase, the population continued to grow, and the mice started to exploit the available resources fully. The population doubled every 55 days, and social hierarchies began to form. Striveĭuring the Strive phase, the mouse population adapted to their new environment and began to reproduce. Universe 25's development was divided into four distinct phases: Strive, Exploit, Equilibrium, and Decline. With abundant resources and no predators, the population was expected to grow exponentially. Initial populationĬalhoun introduced four pairs of healthy, young mice into Universe 25. The enclosure was designed to house up to 5,000 mice, providing them with everything they needed for survival. Each pen had food hoppers and water dispensers, and nesting boxes were available on each level. Universe 25 was a 9-square-foot enclosure, divided into four interconnected pens. The study aimed to observe how the population would grow and change in such ideal conditions. John Calhoun designed a utopian environment for rodents called "Universe 25," providing ample food, water, and nesting material. The study's findings have been used to explore potential consequences of human overpopulation and resource depletion. This experiment aimed to understand the effects of overpopulation on social behavior in rodents. Universe 25 was a famous experiment conducted by American ethologist John B. ![]()
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