In the 50s, 60s and 70s ethologist John B. Calhoun studied the behaviour of rodents in his custom built rat and mice utopias... the results were influential, controversial, fascinating AND a bit fucked!
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Fredrik Knudsen's great doco called Down the Rabbit Hole - The Mouse Utopia Experiments: https://www.youtube.com/watch?v=NgGLFozNM2o&feature=youtu.be
Copy of John B. Calhoun's 'Population density and social pathology' article in Scientific American: http://www.culture-clash.net/pages/evolution/evol_articles/e5calhoun.html
http://eprints.lse.ac.uk/22514/1/2308Ramadams.pdf
https://en.wikipedia.org/wiki/John_B._Calhoun
https://io9.gizmodo.com/how-rats-turned-their-private-paradise-into-a-terrifyin-1687584457?IR=T
https://www.smithsonianmag.com/smart-news/how-mouse-utopias-1960s-led-grim-predictions-humans-180954423/
https://www.theguardian.com/science/the-h-word/2016/mar/23/science-ballard-high-rise-animal-research-pathological-overcrowding