The cloud calls for illness, but the sand is sparse. It's a book-Yuan Yu. I'm sad and lonely, so I'm Shan Wei.
If you want Snow White to fight Alakazam, don't spend Chu Yun yet. However, when it is clear, Dongting stands tall.
It's spring in the north of Saibei at dusk, and the sun shines in the south of the Yangtze River. The injured bow floated on the feather and the thread broke.
Guiyan
I heard that the geese went south from Guangzhou this spring. Watch the flowers rise to the sea, avoid the snow and go to Luofu.
This is a problem when avoiding worrying about guests. Every year, the frost is separated, but the five lakes are autumn.
In autumn, people often see flocks of geese flying south in the sky. They screamed across the sky.
Wild geese are winter migratory birds. There are many kinds of geese, including grey geese, red geese, bean geese, black geese, snow geese, spotted geese, white geese, small white geese and red-breasted black geese. Because of the different species and breeding places of geese, their living habits are different and their migration routes are different.
The home of these geese is in Siberia. Every autumn and winter, they migrate to the south in droves. There are two main ways to fly: one route starts from the northeast, passes through the Yellow River and the Yangtze River valley, reaches the coastal areas of Fujian and Guangdong, and even reaches the Nanyang Islands; The other way passes through Inner Mongolia and Qinghai, and reaches Sichuan and Yunnan, even as far away as Myanmar and India for the winter. The next year, he flew back to Siberia to lay eggs and reproduce.
When geese fly, they often form a "human" shape or an oblique "one" shape. Some people say that this is the performance of strict discipline of geese. In fact, this is the secret of some migratory birds to preserve their physical strength during long-distance migration.
When birds fly, their wingtips will produce a forward airflow called "wake vortex". The birds in the back use the "wake vortex" in front, which makes it much easier to fly. The formation of geese flying is just suitable for using the "wake vortex" airflow. The more geese there are, the more energy will be saved when flying. At the same time, flying in formation can also defend the enemy, take care of each other and avoid falling behind. Because the leading goose has no "tail vortex" to use, it is the hardest, so the formation of the wild goose often changes, and its function is to rotate the head goose so that it will not be too tired.
The geese fly very fast, and can fly 70 ~ 90 kilometers per hour. It takes a month or two to fly thousands of kilometers.
Not only do Asian geese migrate back and forth from north to south, but so do geese in Europe and North America. Whenever the autumn wind sweeps away the fallen leaves, the wild geese in northern Europe move south to Africa, and the wild geese in North America move south to South America. The next spring, they will fly back to their hometown.
Every evening, wild geese land and inhabit reed ponds and grass by the river, looking for aquatic plants to eat, and also eating wheat seedlings and broad bean seedlings in the field. The wild goose is very clever. When they rest at night, they always send a wild goose to stand guard, and when there is any movement, they call out and tell their companions to fly away quickly.