Why do toads keep barking when it rains?

After the rainy season begins, frogs will be heard before it rains, which is as lively as a concert. It turns out that April to June is the breeding period of frogs, and female frogs lay their eggs on the soil of rice fields or the roots of aquatic plants. Female frogs are used to laying eggs after rain. Every time it rains, the male frog sings loudly to attract the female frog. Male frogs use vocal sacs to make sounds. Some quarreling parties have a pair of voice bags, and some have a voice bag on their throats. Male frogs attract female frogs to date with their voices. After the female frog was attracted by the chirping of the male frog, her abdomen began to swell. When the male frog finds that the female frog is going to lay eggs, he leans down on her back and presses her abdomen to help her ovulate and fertilize the eggs.

So before it rains, people can "listen to frogs"

From ks.cn.yahoo.com/question/1307012617363.html.