Glass on buildings, for example, accounts for an average of 599 million bird deaths annually, according to a 2015 study published in the Annual Review of Ecology, Evolution and Systematics. Car collisions account for nearly 200 million avian deaths per year.
Birds are also killed in other forms of energy production, according to Time. A 2012 Bureau of Land Management memo estimated between 500,000 to 1 million birds die annually in oil fields.