What is the sign of cooing?

What do you mean by cooing birds? On behalf of the solar term, summer crops such as wheat and late rice should be harvested and sown.

Before and after the solar terms, cooing birds can be heard loudly almost day and night. It means that the solar term of mango has arrived. The word "awn" refers to the harvest of plants with awns, such as wheat. The word "awn seed" refers to the sowing of rice and cereal crops.

Cuckoo was originally called Cuckoo, also known as Cuckoo. The cuckoo is similar to a pigeon, but it is slender, with a dark gray upper body, a belly covered with horizontal spots, and four toes on its feet. Two toes are forward and two toes are backward, and it flies quickly and silently.