Why can frogs predict the weather

Frog: On the eve of rain, the air humidity increases, and the frog's sensitive skin will feel it immediately. Perhaps for fun, on the eve of rain, frogs will keep chirping, and the volume is higher than usual. Before the weather turned to rain, the humidity in the air was high, the frog's skin was moist, the frog croaked little and the frequency was low. When the storm comes, we can't hear frogs. But on sunny days, frogs will bark loudly.