I was watching some youtube videos of overlord, fromt he crunchyroll channel, and when I watched this one:
https://www.youtube.com/watch?v=d7nIUUcDtgk
I realized there's some "bird chirping" sound at many parts of the video (like for example at 0:29), is this some intentional thing from the anime? or was it made by crunchyroll for the video for whatever reason?
I'm not sure about animation theory and such to know if it was some subliminal thing or what may it be.