Let's discuss ethologist John B. Calhoun's research on the effects of overpopulation on behavior, primarily through his rat and mouse "utopia" experiments:

1) https://en.wikipedia.org/wiki/Behavioral_sink

2) https://www.the-scientist.com/universe-25-experiment-69941

These experiments, most notably "Universe 25," aimed to observe societal collapse in controlled environments with unlimited resources but limited space.

Calhoun coined the term "behavioral sink" to describe the resulting breakdown of social norms and destructive behaviors observed under high population density. While his work was influential and seen as a potential model for human societal issues, its applicability to humans is debated, and modern ethical standards would likely prohibit such experiments today.

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