I remember hearing about the rat study back in the day. And figured that's what is going on in cities with the crimeGiven it's my day off I thought I would post this slightly provocative piece.
It is worth reading what you can find on the behavioural sink model that underpins the piece. The video Molpet linked to made me think of it and I had the link, so ...
https://www.theguardian.com/science...ise-animal-research-pathological-overcrowding