Bunny tug-of-war

To keep them entertained, the bunnies have lots of little toys to play with and toss around. One was stuck in their pen fence. It's shaped like a little wooden barbell with a bell.

Of course, that's the one Lucy wanted, so she started tugging and shaking the whole fence, like this...

It looks like she knows what's holding it back, because she tries to get to the part on the other side to pull it through, but can't quite get it.