What is the performance of female Yan hatching young Yan?

Stay in the nest for a long time. According to the watermelon inquiry video, the most important task for swallows after they fly back from the south in spring is to breed swallows. After the swallows have built their nests, it won't be long before the mother swallows will lay eggs. When there are enough eggs, the swallows will stay in the nest and start to hatch them. The symbol of swallows hatching swallows is to stay in the nest for a long time. In the process of hatching, two swallows take turns to change shifts, and after about 15 days, the swallow can hatch. Therefore, the performance of female Yan hatching young Yan is to stay in the nest for a long time.