商業農場使用的殺蟲劑及化肥是歐洲及英國鳥類數量減少的主要原因，估計有 5.5 億隻鳥類在過去 40 年因此死亡。這些用於農業的化學物質會殺死許多鳥類食用的的昆蟲及無脊椎動物，當中棲息農田的鳥類受影響最大。

Pesticides and fertilizers used in commercial farming is the major cause of bird decline across Europe and the UK, with an estimated 550million birds lost in the past 40 years. These chemicals used in agriculture kill insects and invertebrates that many bird species feed on, and farmland birds are most affected.

https://theconversation.com/europe-has-lost-over-half-a-billion-birds-in-40-years-the-single-biggest-cause-pesticides-and-fertilisers-206826