clutterydrawer
Wise Old Thumper
Research on mice has shown that those who live in a challenging environment live nearly 30% longer than those who in a secure but boring environment.
Presumably the same would apply for all species - maybe it's something to keep in mind when housing our bunnies.
Obviously there are limits - I'm not saying anyone should line their hutch with razor blades or buckets of petrol - but it's food for thought. At the very least it emphasises the benefit of a stimulating environment.
Although I would like to see the writeup of the whole study really - this was just a brief mention in another article, here if you want a look.