For context, the bird population in North America has declined by around 3 billion since the 70s: a 30% decrease. https://www.scientificamerican.com/article/sil

For context, the bird population in North America has declined by around 3 billion since the 70s: a 30% decrease. https://www.scientificamerican.com/article/silent-skies-billions-of-north-american-birds-have-vanished/ https://www.scientificamerican.com/article/silent-skies-bill...