A long-term study near Basel shows a massive decline in grass frogs despite dozens of new ponds created in the study area.
The population of grass frogs in Basel-Country has shrunk by more than three-quarters since 1988.
Keystone-SDA
The common frog is faring worse in the lower-lying areas of Switzerland than previously thought. A long-term study near Basel shows a massive decline, even though dozens of new ponds were created in the study area.
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