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In this video:

In 1968, an expert on animal behaviour and population control called John B. Calhoun built what was essentially a utopia for mice that was purpose built to satisfy their every need. Despite going out of his way to ensure the inhabitants of his perfect mouse society never wanted for anything, within 2 years virtually the entire population was dead. So what happened?

Want the text version?: http://www.todayifoundout.com/index.p...

Sources:

https://eprints.lse.ac.uk/22514/1/230...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://circulatingnow.nlm.nih.gov/20...
https://books.google.co.uk/books?id=q...
http://www.cabinetmagazine.org/issues...
http://www.smithsonianmag.com/smart-n...
https://en.wikipedia.org/wiki/John_B....