The report is the most complete survey of land bird numbers to date and attempts to assess the health of populations on a continental basis. It concludes that, while there are still a lot of birds in the sky, there aren’t anywhere near as many as there used to be.
Evening grosbeaks are down 92 per cent since 1970. Snowy owls have lost 64 per cent of their numbers. The Canada warbler has lost 63 per cent of it population.