[antwerp1]

I spent one evening laying on the Yosemite valley floor, from dusk until well past the moon and stars had made their appearances. The entire time I was there, frogs were holding a concert. And sound echoes between the rocks.

I think timing might be an interesting factor to introduce, e.g. all forests at sunset.

[magneticnorth]

I clicked around in the southern appalachians on this map, and there are a few nighttime recordings from there. The night ones are very loud with frogs and insects, in contrast with the daytime ones that are mostly birds.

Maybe as they get more data that'll be something you can filter on.