I forgot to mention, but if you do plan to put any kind of small rocks in, to make the most of it, I'd recommend laying down some landscape cloth first so that the rocks or pebbles don't sink into the ground.
I also put pine straw in 2 spots where the ducks loaf.
Quote:
My aviary is almost the exact same dimension.
I think mine is 5.5 wide, 13 or 14 long and 7 feet high.
I use a combination of sand/dirt and 2 sizes of pebbles in mine.
I use larger 1 inch jade pebbles all around the pond area to prevent mud going in and around the pond area.
I also...