Bird's nest is also known as agarwood, bird's nest, bird's nest, bird's nest, etc. It is a valuable cooking raw material and supplement, but there is no research evidence to support the claim that its nutritional value is extremely high. The raw material of bird's nest is the nursery nest made by swallows in caves on the cliffs of the seaside in Southeast Asia, using their saliva combined with down, grass leaves, or plant stems. The nests will be abandoned after the young swallows hatch and grow up. In order to avoid the danger of climbing rocks to pick the nests of cave swallows, some farmers also build artificial swiftlet houses for swiftlets to build nests. However, these house swallows still forage on their own just like the cave swallows and are not supported by feed. These bird's nests are manually sorted out of fluff and other debris before they are made into edible bird's nests with swiftlet saliva as the main component.
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