'With an abundance of food and places to live and with predation and disease eliminated or minimized, only the animals' behavior with respect to one another remained as a factor that might affect the increase in their number. I confined a population of wild Norway rats in a quarter-acre enclosure. Reading the article you mentioned, Calhoun (1962) started with wild Norway Rats, also referred to as common rats, brown rats, street rats, sewer rats, or Hanover rats. They were dubbed 'the beautiful ones.' Breeding never resumed and behavior patterns were permanently changed.No, Calhoon did not account for genetic diversity in his experiments outlined in your question. Sleek, healthy coats and an absence of scars characterized these males. They ate, drank, slept, and groomed themselves all solitary pursuits. Their male counterparts withdrew completely, never engaging in courtship or fighting and only engaging in tasks that were essential to their health. During this period females ceased to reproduce.

After day 600, the social breakdown continued and the population declined toward extinction. They'd move half sheir liaer away from danger and forget dhe rest, Someaimes they'd drap and abandon baby while were carrying The few secluded spaces housed population Calhoun called, 'the beaunlfidl Generally guarded by one male, the females-aned few males-inside che space breed or fight or do anything eat and groom and sleep, When che populanion declining beautiful ones were spared from violence and death, but had complerely last couch with secial behaviors, including having sex or caring far their yourig. Pew females carried preqnanctes to corm, and dhe ones chat did seemed simply forget about heir babies. They gathered in the main squares, waiting to be fed and occasionally attacking each other. John Calhoun mouse utopia experiment last born with pair of mice At the peak population, most mice spene every living second in the company of hundreds of other mice. Scientists extrapolate this model to humans Number of mice in on earth. Once a tipping point was reached, the mice lost instinctual behaviors. The colony peaked at 2200 and from there declined to extinction. iFunnyġ0 mar 1 0 There was man-made mouse utopia called Universe 25. They were dubbed 'the beautiful ones.' Breeding never resumed and behavior patterns were permanently changed.

There was man-made mouse utopia called Universe 25.

Mouse utopia experiment was right