But the science of bird study was advancing, and a close-knit group of scientists was experimenting with using radar imagery, satellite photos, and citizen scie

But the science of bird study was advancing, and a close-knit group of scientists was experimenting with using radar imagery, satellite photos, and citizen science to add precision to the dozens of conventional bird counts done for groups of species. Curious how this determines the total bird population today vs the last 50 years without a whole lot of speculation and estimation based on ___________. Is the author assuming that when a wooded area is cleared to make a pasture, the birds just vanish? Is the author assuming there are no tree lines or hedgerows surrounding pastures? Is there an assumption that fields don't have an abundance of seeds? What exactly is citizen science? This kinda sounds like a problem formulated to generate more study/grants. The end is neigh.