https://dxnest.com/to-yen-sao/
If you love eating seafood or savouring beef, you might also be a fan of the humble yet luxurious bird nest. It is an ingredient in the popular Chinese delicacy of bird’s nest soup and is believed to have healing properties. It is even believed to slow down aging, improve digestion and increase concentration and libido. However, not all bird nests are created equal. There are only a few species that produce the edible nests that can be commercially cleaned and sold. These are the Aerodramus fuciphagus, the Aerodramus maximus and the Collocalia esculenta (