Why did all the swallows disappear on the seventh day of the seventh lunar month?

On the seventh day of the seventh lunar month, it usually rains or the weather is wet. Swallows in the sky will feel their wings wet and it is difficult to fly high. So they won't appear in the metropolis. Legend has it that every year on the night of the seventh day of the seventh lunar month, they will build a bridge in the sky with their wings, which is what we often call the "Magpie Bridge". The cowherd on the ground can carry their two children and set foot on this bridge to meet the Weaver Girl at the other end of the Milky Way.

July is the day when swallows migrate. According to the verified data, swallows in China will eventually choose to spend the winter in tropical provinces such as Hainan, Yunnan, Taiwan Province and Southeast Asia. Swallows from other countries in East Asia will migrate to Southeast Asia, Australia and Central Asia and spend the winter in India in South Asia.

Swallows in Europe are better, crossing the Mediterranean and Sahara deserts to spend the winter in southern Africa. Swallow is a migratory bird. Every migration is a life adventure, which can only be done in order to survive.