Ever since learning of the Mouse Utopia (where did "mouse 'heaven'" come from?) experiment, I found it interesting that its results spoke more directly of LOCALIZED overpopulation. In a human context: cities. Many of the pathologies observed in the experiment are very starkly displayed in human cities. I've always found it odd that those most interested with overpopulation concerns also advocate for cities as part of a way to solve the issue, when they really only exacerbate the problem.