What season is it when swallows fly back?

For southerners, it is autumn when swallows fly back, and for northerners, it is spring when swallows fly back.

The important phenological sign of the vernal equinox is the swallow. This kind of bird, which is close to human beings, will migrate to the southern islands collectively in winter because it is afraid of cold, but it will fly back collectively around the vernal equinox. But unlike other birds, this bird knows its hometown, and when it flies back, it often stays in the home of its old owner, just like a friend or a child from afar.

In China, swallows not only represent auspiciousness and spring, but also represent feelings and thoughts. Spring Society refers to the ancient countryside, which is an important ceremony of spring land, usually around the vernal equinox.

The so-called "swallows fly in pairs", that is, swallows fly back at the vernal equinox. It is this kind of affectionate and righteous return that reminds people of their friends or relatives and people they miss.