Last year, the annual output of bird's nest was 1200 tons, but good bird's nest was carefully selected among them, so it was relatively limited. After Yanwu lured Jin Siyan to nest in it, it is convenient to collect bird's nest now. With Yanwu, Jin Siyan has a good habitat and breeding environment, and their number has increased geometrically. A pair of Jin Siyan can lay two eggs at a time, three times a year, and can grow ***6 little Jin Yan. Rebuild the nest every time you lay eggs, and refuse to use the old nest.