What do you mean, all the birds are here?

It refers to the active insects in the field and the pursuit of migratory birds during Xiaoman period.

Source: Liang et al. "Complete Works of Festival Xiaoman in Ancient and Modern China and Foreign Countries": North China agricultural proverb says: Xiaoman is strong in transplanting rice, and crops are prevented early. Reflects the local actual situation. Generally speaking, migratory birds will chase insects. At this time, insects are more active in the field, so we should be prepared to prevent insects.

Xiaoman is the eighth of the 24 solar terms and the second solar term in summer, when the sun reaches 60 degrees of the yellow meridian. China has a vast territory, and the climate between north and south is quite different. Many plants grow differently in the full season. For wheat, the main grain crop in the north, Xiaoman is the season when the ears of wheat are about to be full, which indicates that the busy farming is about to begin, the barley is drooping and the wheat is yellow.