Recently, a woman encountered a rare scene while picking up her children from school:Many wild geese are flying north in the sky, but unlike the common ones arranged in a straight line or herringbone, these wild geese actually form English letters similar to "ETC".
Such a scene attracted many people to stop and watch. Many people expressed emotion on the spot and said it has been a long time since we last saw each other. Some people joked that they thought it was "EXO" at first.
It is reported that geese work as a team when migrating. When their wings flap, they can generate updraft vortices. When the geese are in this updraft area, they gain additional lift, reducing wing flapping frequency and energy consumption.
When the leading goose gets tired, it will automatically rotate to both sides of the team, allowing other energetic geese to take over, ensuring the overall migration efficiency. Research shows thatCompared with flying alone, flying in formation can save more than 30% of physical strength, and the endurance is increased by 70%..
However, when the wind speed is >4.2m/s, the traditional "herringbone" shape will increase energy consumption due to airflow disturbance, while the straight column can save the third goose behind the leading goose 27% of its energy. This formation is particularly efficient under headwind conditions and is a flexible adjustment for the geese to cope with complex airflow.
As for why the "ETC" pattern appears this time, there is currently no scientific explanation. We can only say that it is a coincidence or the visual misalignment of people on the ground..
