https://en.wikipedia.org/wiki/Behavioral_sink https://en.wikipedia.org/wiki/Behavioral_sink TLDR; they built a mouse utopia universe 25 with plenty of food wat

https://en.wikipedia.org/wiki/Behavioral_sink https://en.wikipedia.org/wiki/Behavioral_sink TLDR; they built a mouse utopia universe 25 with plenty of food water and space . Eventually some grew violent, others sat and groomed themselves all day, they stopped breeding and died out.