Where can I find Dust Spirits?

"kalaksed;c-17054650" wrote:
they're actually my favorite 'insect' in outdoor retreat and make their way into more than a few of my households (mostly the 'weird' ones) just because they're based on the soot sprites from miyazaki movies such as 'spirited away' and 'my neighbor totoro'

here's a shot of some jumping around in my plantsim house:

Spoiler

https://i.gyazo.com/30316b3cac22cf8a3a43c9d766256130.png

they are, indeed, rare and are only found at night (and not in the campgrounds area), similar to the willowisp (which is only in the hidden glade) and rainbow firefly (found pretty much everywhere)