I've recently upgraded my recording device, and will make a large library available in higher quality one day.
Worth mentioning the huge database of Freesound https://freesound.org/browse/geotags/
I think timing might be an interesting factor to introduce, e.g. all forests at sunset.
Maybe as they get more data that'll be something you can filter on.
Good movie!
And if any geeks want to get involved with adding to the recordings but don’t want to invest much, I have a raspberry pi recorder project that can help. It even runs on a pi zero.
https://github.com/hcfman/sbts-aru
As an added bonus, if what you are recording can be heard on three recorders or more you can sound localize with them. Find out where that wood pecker is pecking from for example.
Lastly. You can synchronise the time on all your computers with it as it doubles as a time server with sub-microsecond time accuracy.
(PS. Love the comments about New Zealand here, I’m from New Zealand :-) )
When I lived in England for a year, I'd play recordings of New Zealand forests in the background because I was so homesick for these bird sounds.
I also spent half a year on Steward Island during my first winter where there's a lot of kiwi birds and I still catch myself waiting for their calls in the forest next to my home in Europe at night haha!