Within 30 years, the bird population around Lake Constance declined with increasing rapidity. While in 1980 around 465,000 breeding pairs were still living in the region, by 2012 the number had fallen to 345,000—a loss of 25 percent. These are the findings of a study carried out by researchers from the Ornithological Working Group at Lake Constance and the Max Planck Institute of Animal Behavior. Bird species that were once common like the house sparrow, the common blackbird, or the common starling have dwindled particularly rapidly. The numbers of many other species are too small for survival and their habitats in the Lake Constance region are shrinking.
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Source: Phys.org