Everyone should know that bird's nest is made of swallow's saliva, so all swallows live in it. How can they say that such a thing is rare? What's special about it? Indeed, every swallow can build a nest, and there is such a thing as saliva, but! Only a bird's nest built in Jin Siyan can be called a bird's nest. Everyone saw how their bird's nest was built. It consists of soil and weeds.
Jin Siyan is really different. The raw material of its nest is saliva. Jin Siyan usually nests on steep rock walls. Surprisingly, this saliva does not always exist in Jin Siyan. It is a colloidal liquid secreted by salivary glands in reproductive season, which contains many substances beneficial to human body.
At the beginning of nesting, Jin Siyan, a male and a female, repeatedly flew to the rock wall in the selected place. Every contact, he will spit the liquid in his mouth on the rock wall. When he meets the air, the rock wall quickly dries and becomes filiform. After spitting for countless times, it will draw a semi-circular outline on the rock wall, and then gradually add a convex edge to form an elbow-shaped nest layer by layer, which has high strength and strong adhesion and looks like a white translucent half-moon cup.
Bird's nest is a nest made of saliva, feather and other fluff of white and other birds. Shaped like an ingot, the outer wall of the nest is piled up into irregular prismatic protrusions by dense filaments with horizontal knives, and the inner wall of the nest is woven into irregular grids. The nest bowl has a solid root and a small angle at both ends, generally 6-7 cm in diameter and 3-4 cm in depth. Mainly produced in South China Sea Islands of China and Southeast Asian countries.
Jin Siyan is also found in China, but basically does not produce bird's nest. Jin Siyan can nest at different times every year, and reasonable picking will not affect the normal reproduction of Jin Siyan.