This video was made as a school project. It tells you something about the effect we have on our environment. Songbirds are able to adjust their singing to the amount of ambient noise.
The research I am talking about is this one:
Derryberry, E. P., Phillips, J. N., Derryberry, G. E., Blum, M. J., & Luther, D. (2020). Singing in a silent spring: Birds respond to a half-century soundscape reversion during the COVID-19 shutdown. Science, 370(6516), 575-579.
Music at the end of the video: Flitz&Suppe - Funkaholic