Hongyan is a large migratory bird, which moves southward every autumn, often causing homesickness and wandering sorrow. For example, Xue Daoheng, a native of the Sui Dynasty, wrote that "people are homesick every day". After the geese fall, people think before the flowers. I had the idea of going home long before Bloom. But when the geese returned to the north, people had not returned home. When the poet was an official in the Northern Dynasties, he sent envoys to the Southern Dynasties and wrote this homesick poem, which was subtle and tactful.
There are also letters referred to by Hongyan. Everyone is familiar with the allusions of Hongyan biography, and the application of Hongyan as a messenger in poetry is also very common. For example, "the geese never answer me, and it rains cats and dogs (I don't know when my letter will arrive, but I'm afraid it's a long way and full of wind and rain." ) "and so on.
Morphological characteristics of swan goose;
Beauty is similar in sex. However, the female bird is slightly smaller, with short wings and an inconspicuous wart at the base of her mouth. Adult birds are dark brown from the base of the forehead, the top of the head to the center of the back neck, and there is a thin brown-white line between the base of the forehead and the mouth, which completely separates the mouth from the forehead.
The head, chin and throat are light brown, and there are two brown jaw lines at the base of the cleft mouth. The back, shoulders, waist and wings are covered with feathers, and the tertiary flight feathers are dark taupe, with pale or white feather edges, forming obvious white stripes or horizontal stripes. The tail is covered with dark taupe feathers, but the longest tail is covered with pure white feathers, and the tail feathers are taupe.