Well, aviaries are a bit different than keeping a hedgeysnog I think. They can burrow after all and you won't be able to keep them inside will you?
Mick (my step-dad kinda person) used to take them from over-populated places and he had loads of land.
2 Kestrels
1 Honey Buzzard
1 great spotted African eagle owl
2 Snowy owls
1 massive American Eagle owl aswell-it was scary as HELL!
EDIT: Forgot 'tiny' the tiny owl-cuuuute!!
(From what I can remember-there were more, but I liked feeding them
)
They couldn't go back into the wild as most of them had injuries or were captivity-raised one's so he used to take them on and care for them, it was lovely