If this guy is worried about declining populations of house sparrows, I can ship him some. We have way more than enough house sparrows here in Montreal.
People make the most annoying noises on public transit, from chewing gum to tapping their feet to playing their music too loud with or without headphones. It annoys me so much that I now wear earplugs.
(I read the "information" in a nature book when I was a kid.)
This story shows how art can express what otherwise can't be expressed.