Animal Regulation by Liu Di

I really love this series of photographs -- which I have decided to believe are not digitally manipulated in any way -- depicting animals that have gotten too big for their surroundings, or perhaps surroundings that have gotten too cramped for the animals. It's a little sad that none of the animals are looking at the viewer, although I don't know if that means they're ashamed, irritated, silently contemplative, or just shy.

It is also interesting and enjoyable to think about what exactly the title might mean. Are these animals enforcing a regulation? Or are they being subject to one?