While Phases A and B exhibited plenty of promise for the lab rats of "Universe 25", circumstances turned noticeably sour in Phase C. Calhoun marked the evolution of "Universe 25" through a series of phases: Phase A- the initial period of adjustment to the environment, Phase B- a period of exponential growth among the mouse population, Phase C- the final period of growth among the mouse population, and finally Phase D- the decline and extinction of the mouse population. "Universe 25" was free of predators, held an endless supply of food, water, and nesting material, and was kept at a balmy range of 70-90 degrees. Calhoun constructed a utopian environment, dubbed "Universe 25", for four pairs of house mice (Calhoun 82), and observed their behavioral patterns over a period exceeding five years. In pursuit of truths inherent to societies of mammals, renowned ethologist John B.
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