When the climate is dry, frogs are in the water, and when it rains, frogs are on the shore. Why?

Frogs are amphibians, with lungs, but their development is incomplete, so they can't fully provide the oxygen needed by the body, and they can only exchange gas directly through the skin. But to breathe through the skin, you must keep the skin moist.

When the weather is dry, the frog's skin is not easy to keep moist and can't breathe in the air, so it will hide in the water. When it rains, the air is moist, which can keep the skin moist, so the frog runs to the shore.