Phase C: Stagnation Days 315-560, This is when the mice behavior began to mirror those of the rat experiments as a large clump of outcast male mice formed in the center of the cage and would violently attack one another.Phase B: Exploitation Days 104-315, This is when the population began increasing, doubling every 5 days and the brood began clumping despite no influence from the cage design.Phase A: Adjustment Days 0-104, this was before any new mice were born and was marked by "considerable social turmoil" as they adjusted to themselves and their expanded new surroundings.In the most famous experiment "Universe 25" Calhoun found four distinct phases. Half were performed with 32 mice and the other half performed with 56. Calhoun performed several experiments using albino mice using even composition of male and female that had just reached maturity. Calhoun feared that some of these behaviors may happened in human society among highly crowded areas like most big cities leading to civilization and societal collapse. Its first study’s result were published in 1962 in Scientific American titled: Population Density and Social Pathology. A second experiment was made in the 1970s with a 101-inch square cage and using mice, reaching a population about 2200 mice. The experiment was stopped when conditions of the rodents became too extreme even for the ethical standards of the time.
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