Jizu, that's too funny!
Damn us pesky humans keep coming along and re-planting everything the axies have taken all that time over digging up. I can just imagine them waking up after a nice snooze and sighing cause they've gotta dig it up all over again!
In terms of how I spoil the fun for my lot, I've actually discovered hair ties are brilliant for the job, stretch around rocks really easily, and I've got tons of them lying around. Just need to make sure it isn't too tight. (or loose)
I also use cotton, like Eric said. Super easy to wrap around larger objects, I used this for attaching a load of moss to a root ornament.
I was worried that they we gonna uproot all my grass, as they kept snapping at it and pulling it out, but they seem to have realised that it feels nice on their tummies, and are leaving it well alone now!