European scientists point to the disappearance of some 20 million birds on average each year. The number of forest birds has decreased by 18%, a drop of 28% for urban birds and even 57% for birds in agricultural areas.
The decline is marked in species such as the grey flycatcher (-63%) or the famous house sparrow (-64%). To stop this collapse, we would have to start by changing the model of agriculture, says Vincent Devictor, one of the study's authors.