Certain forms of theft and violent crime have been running rampant in NZ. In other news...

Shock, horror! When you put 20 rats in a cage with only enough space and food for 10, they'll fight and steal from each other in an attempt to survive. But new research reveals, this is not a consequence of "rat nature", and can't be blamed entirely on the behaviour of a minority of "bad apples" among the group of rats.