I had 2 hollow-ish logs in my aviary for a while, but ended up trading one out for a thinner branch tunnel that provided a better bulk-to-shelter ratio. I did leave one big log that stays propped up on its own and provides a lot of cover, and I layered sticks and large strips of bark over the top to make a sort of "roof" for it. The log itself is bulky, but it has like 3 little "caves" that the birds seem to like to lay their eggs in, so it stays for now. I also got some grass rabbit houses seen in the 3rd pic, that provide a closed-in area (I find eggs in these, too). The grass houses will be difficult to keep clean, though, so I won't be replacing them once we get the nest box built. (The pearl in particular likes to perch on top of the grass houses and poo on them all day

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