What is the structure of egrets?

Egrets belong to birds. Because egrets need enough oxygen to fly, they have developed an efficient respiratory system. The system can be divided into three different parts: front airbag (located in clavicle, neck and chest), lung and back airbag (located in abdomen and chest).

Egret's lungs can only let air flow through, but can't store air, and the airbag is responsible for storing air. The airbag is not responsible for the exchange of gas, but it acts like a bellows, allowing fresh air to pass through the lungs at a relatively constant speed.

The front airbag and the rear airbag usually add up to nine, of which only the clavicle airbag appears alone, and the other airbags appear in pairs. Some, such as passeriformes, have seven airbags, and their chest airbags and collarbone airbags are connected, even fused together.

It usually has a light skeleton, light and strong muscles, circulatory system and respiratory system, which can support high-speed metabolism and oxygen supply. These add up to enable birds to fly. The appearance of beak made the egret evolve a special digestive system. These special anatomical features make birds occupy an independent class (organism)-ornithopods in vertebrate phylum.

Extended data

1, Egret "Quiet as a virgin, beautiful as a fairy" has been a cultural bird admired by literati since ancient times, and it is also a favorite theme of photographers.

2. Egrets inhabit coastal islands, coasts, bays, estuaries and rivers, lakes, ponds, streams, rice fields and swamps near the coast. You can see individual, paired or integrated small group activities, and occasionally dozens of large groups are together.

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