I’d be remiss if I didn’t also mention Zealandia when talking about the return of native birds to the capital. It’s large sanctuary in the city suburbs that’s completely surround by a 1.8 - 2.2m (6.2 - 7.2 ') predator exclusion fence. This area allows native birds a space to thrive without rat predation. It’s been so successful that threatened birds are growing in numbers and returning to areas outside of the sanctuary - good example being the Kaka (not an owl but still superb) which seem to growing steadily in number in my area.