Swans are large birds, with the largest measuring 1.5 meters in length and weighing more than 6,000 grams.

The swan is a large swimming bird, about 1.5 meters long, and can weigh more than 10 thousand grams. The whole body's feathers are white, the beak is mostly black, and the upper beak to the nostril is yellow.

Their head and neck are very long, accounting for about half of their body length. When swimming, the neck is often stretched out and the two wings are attached. Because of their elegant physique, swans have become the embodiment of innocence and kindness throughout the ages.

Swan in people's eyes is an unattainable beautiful thing, its dignified and elegant temperament, in the natural world is simply a solitary status. However, most of us focus only on the beautiful appearance of the swan. But do you know how high the highest white swan can fly, and why the swan flies so high?

Most birds fly to a height of several hundred meters is already the limit. But for swans, a few hundred meters is just a casual flight. Because swans are the champion of flying height among many bird animals.

We all know that the world's highest mountain, Mount Everest, which for most birds is a high climbing height. For swans, flying over Mount Everest is just a matter of ease and comfort. Because swans can fly up to 9,000 meters!

There are three species of swans in nature: the Trumpeter Swan, the Mute Swan, and the Trumpeter Swan.

How can swans fly so high? And what is the reason for flying so high? One of the most important reasons is that swans adapt to the environmental conditions on their migration journey. After all, swans migrate long distances and need to stop for food many times along the way.

Swans migrate through many high mountains, and the migration time is tight. If the swans bypass the mountains, it will take about twice as long to cross them directly. Therefore, crossing the mountains becomes a must for the swans on their migration.

Want to fly so high you must have the physical qualities and conditions of high flying. After all, the higher the oxygen is thinner and the lower the temperature. The swan's unique respiratory system is just for their high-altitude flight to provide fine equipment.

Compared with humans, swans in addition to breathing with the lungs, also has a long used to reserve oxygen similar to the part of the sac. Therefore, the swan even at high altitude flight will not appear to lack oxygen. And the swan's superb ability to withstand low temperatures helps it soar at high altitudes.

Swans are larger than other flying animals, and their abundant wings and feathers make them naturally heavier. Therefore, swans need to assist in running for a distance before taking off, like an airplane taking off. Swans begin their annual migration to their wintering habitat in September.

Swans can even endure ultra-low temperatures at 10,000 meters, so why do they migrate en masse to a warmer place for the winter? This is because swans mainly feed on algae or small aquatic animals under the water.

But in the winter, the temperature is too low, the water surface freezes and the swans have no food. So they start to migrate collectively, and in the end, they still want to eat!

So that's why the swan is the flying high champion. Because to survive.