Edible bird's nest
Edible bird's nests, also known as swallow nests (Chinese: 燕窝; pinyin: yànwō), are bird nests created from solidified saliva by edible-nest swiftlets of various genera Aerodramus, Hydrochous, Schoutedenapus and Collocalia, which are harvested for human consumption. Swiftlet nests have been used as a delicacy for over 400 years, most often as soup.