North American and European songbird populations have declined by billions of individuals since the 1970s, with welfare implications for the vast numbers of birds experiencing habitat and food source loss.
The dramatic decline in songbird populations represents both a conservation crisis and a welfare tragedy affecting billions of individual birds. Birds dying from starvation as insect populations collapse, killed by cats and windows, or dying during increasingly unpredictable migration conditions are individually suffering. While individual welfare is harder to track than population statistics, the scale of mortality and suffering implied by the loss of three billion birds is enormous. Addressing these causes - agricultural reform, cat management, building design, and climate action - serves both conservation and individual welfare goals.