Bird biodiversity is declining. There is a 29% total bird decline since 1970. Birds are a critical part of the living tapestry. When birds decline, pest increases and pollination decreases. Pollination is responsible for our food supply. Agriculture, chemical use, and loss of grasslands contribute to the songbird decline. Scientists are just beginning to study the impact of chemical use on the bird population. Scientist found robust evidence of the negative impact of chemical use on bird populations.
https://aces.illinois.edu/news/decline-us-bird-biodiversity-related-neonicotinoids-study-shows