![]() This led to «beautiful» males and passive females becoming a majority and, consequently, birthrate falling to zero. They were totally passive, just eating, sleeping and cleaning themselves. A new type of society was formed – so called «beautiful» mice – males, who refused fighting for females or territory, mating or playing any other social roles. ![]() As a result, birthrate decreased and mortality among the young increased. They often killed their progeny and got solitary. Mice started dying out, practicing homosexuality, cannibalism and showing unexplainably aggressive behaviourįemales also became more aggressive due to lack of protection and refused to breed. A so called «outcast» group was formed: young mice without any certain social position, often attacked, without the desire to mate or protect their pregnant females. Due to absence of any diseases and unlimited food lifetime became much longer, older mice didn’t give up social roles for youngers. Quite soon population growth started slowing down and a clear social hierarchy formed. At the peak there were only 2,200 mice living together. But never during the experiment population reached its maximum even closely. They started to reproduce fast, understanding what a perfect place they are lucky to be inĪt the beginning the scientist placed 4 mouse couples in that complex and they started to reproduce fast, understanding what a perfect place they are lucky to be in. The box could accommodate more than 9,000 mice at the same time without the worsening of living conditions. In 1972, animal behaviorist John Calhoun built a complex, giant box for mice with perfect life conditions provided: unlimited delicious food and water, healthcare, ideal temperature, cozy places for living and breeding, waste sanitation was in place and the appearance of predators was excluded.
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