Hey, sorry for the late response, I don't really use Newgrounds too much (You can follow me on Soundcloud, where I have some more music, and where I'm usually active :) )

Regarding the birds, I use a lot of ambiance samples in my tracks, including restaurant noises, sea waves, rain, and in this case some chirping birds :D In my opinion, it can really add to the atmosphere!

Thanks for the message! <3