so i have a pen that is 9x14 and 6 feet high that has 3 houses in it for my 4 ducks and 4 chickens and this is mainly for when the sun comes down. during the day all the birds are left out and free range the whole yard and i recently rescued my 2nd rabbit and they are both now living inside the cage during the day. they love burrowing running etc. yesterday i fell in one of their holes! lol i didnt mind but was worried about a bird falling in and didn't think it was very safe. so i am building a seperate pen just for the bunnies and it will be about 8x8 with a tented roof. the only concern is should i give them a foot under the cage to burrow and cover it with wire so they can't leave or wire the entire bottom with a small area to burrow??? if i dont let them burrow is it worse off for the bunnies? i dont feel like falling in a hole when i go in their to clean everyday lol. any advice???