We tried that with golf balls but it didn't work.
The odd, or maybe not so odd thing is that the hens only lay in one of three nests? We tried putting golf balls in the other two to see if they would lay in the other nests but they just started to leave them on the ground?
I've longed for chickens and these were given to me on my birthday this year!! so I'm just learning all about chickens and the snakes that want to eat their eggs!!