"hypersexual", "rodent utopia", "complete devastation of humanity"
Yes, these are teaser phrases, but they are from an (in)famous rodent crowding study. Essentially, rats were crowded into confined quarters with unlimited food and water.
Read on, if you dare.
http://nihrecord.od.nih.gov/newsletters/2008/07_25_2008/story1.htm
“The one thing they did not have was space...He allowed the population to grow to 80 in the first instance.”
Calhoun found that “rodent utopia” rapidly became “hell.”
He described the onset of several pathologies: violence and aggression, with rats in the crowded pen “going berserk, attacking females, juveniles and less-active males.” There was also “sexual deviance.” Rats became hypersexual, pursuing females relentlessly even when not in heat.
The mortality rate among females was extremely high. A large proportion of the population became bisexual, then increasingly homosexual, and finally asexual. There was a breakdown in maternal behavior. Mothers stopped caring for their young, stopped building a nest for them and even began to attack them, resulting in a 96 percent mortality rate in the two crowded pens. Calhoun coined a term—“behavioral sink”—to describe the decay.
As the population grew past capacity, Calhoun observed a developing social hierarchy with toxic pathologies.
“He clearly saw these rats and mice as models for man,” Ramsden explained. “Life in an unnatural urban environment of ever-increasing density could result in the complete devastation of humanity.”
It seems, however that the results may not correlate to human populations. You be the judge.
gd