Frogs are a common kind of animals in China, and they will croak. However, frogs don't make such calls in all seasons. For example, in winter, frogs will go to sleep because of the low surrounding temperature, and naturally they won't sing. In other seasons, the frequency of frogs singing is different. In summer, frogs are more likely to make songs and calls with higher frequency. Especially after rainy days, frogs are very easy to make calls. In addition, during the breeding period of frogs, adult frogs will also make songs and calls, and the calls are very loud. Generally speaking, the breeding period of frogs is from March to April, and sometimes it is delayed to May to June.

As described above, frogs croak, especially during rainy summer weather and breeding season. The croaking of frogs is actually caused by the vibration of air in their croaking bags. In fact, sometimes frogs don't make calls, they will stay quietly somewhere.

Frogs make calls for a reason. They make noises on rainy days because the environment at this time is more suitable for them. Although frogs can breathe with their lungs, they are amphibians, not a particularly advanced animal, and their lungs are not particularly advanced, so they need skin to help them breathe. On rainy days, when the air is moist, their skin will be moist, so they will be more active and make a loud cry. In addition, frogs also sing during the breeding season. At this time, they make calls because they need to attract the attention of the opposite sex and achieve the purpose of finding a mate.