Bird's nests are nests built by mixing the saliva secreted by some swifts of the order Swiftidae and several species of swiftlets of the genus Swiftlet, and mixed with other substances.

The bird's nest is a bird's nest called a "swift", which is made of moss, seaweed and soft plant fabrics mixed with their feathers and saliva as a hiding place. People take down this kind of bird's nest, and after refining and selecting it, it becomes a valuable bird's nest.

"Swifts" build nests three times a year. The first time they build a nest is thick and white. Because after a long winter, swiftlets have a long time to recuperate and store enough nutrients in their bodies. The quality of saliva is better, so the nest built is better, thicker, and has a particularly good shape, forming a cup shape, so it is called a bird's nest, which is the best among bird's nests.

There is a kind of bird's nest called "blood swallow", which is built by a kind of "brown-tailed swiftlet". This kind of swallow may drink different water quality, or it may be caused by the food it eats. The feed may contain minerals and other factors that cause the saliva to turn red, thus building a "blood swallow" nest.

The main producing areas of bird's nests:

The main producing areas of bird's nests range from the Philippines in the east to the caves on deserted islands near the coast of Myanmar in the west, including Southeast Asia such as Indonesia, Malaysia, Sandakan, Singapore and Thailand. Most of them are found in the sea area and the islands in the South China Sea of ??my country. Among them, Indonesia's weather and environment are the most suitable for swallows to live together, so the quality of Indonesian bird's nests is the best, and the output of bird's nests in Indonesia is also the largest, followed by Malaysia.

According to statistics, as of the end of 2010, Indonesian bird's nests accounted for 85-90% of global bird's nest production, Malaysia accounted for 5-10%, Thailand accounted for 3%, Vietnam, the Philippines and other places accounted for about 2% (refer to the Hong Kong Trade Department's data for several years) . A subspecies of Javan swiftlets, Cfuciphagagem ani, has been harvested on Yannan Island, which can produce edible bird's nests.

Reference for the above content: Baidu Encyclopedia—Bird’s Nest