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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, Indian swiftlets and other swiftlets of the genera Aerodramus, Hydrochous, Schoutedenapus and Collocalia, which are harvested for human consumption. Edible swiftlet nests, packaged for sale
The nest before use in bird's nest soup. The nest used in bird's nest soup is composed entirely of saliva. The soup is made by soaking and steaming the nests in water. It is said to improve kidney health, reduce phlegm, and to be an aphrodisiac. [10] [16] The nests can fetch high prices and many colonies are harvested commercially.
Authentic bird's-nest soup is made from nests of some species of swiftlet, mainly the edible-nest (or white-nest) swiftlet (Aerodramus fuciphagus) and the black-nest swiftlet. Instead of twigs, feathers and straw, these swiftlets make their nest only from strands of their gummy saliva, which hardens when exposed to air.
The Indian Swiftlet or Indian Edible-Nest Swiftlet (Aerodramus unicolor) is a small swift. It is a common resident colonial breeder in the hills of Sri Lanka and south west India. The half-cup nest is built on a vertical surface, often in a cave. The male swift uses thick saliva to construct the white, shiny nest into which two eggs are laid.
Cliff swallows are not common birds and to have them nesting on our vinyl-sided house is very unusual as they traditionally prefer nesting under bridges or eaves of old barns.
Nesting mossy-nest swiftlets. The nest of many species is glued to a vertical surface with saliva, and the genus Aerodramus use only that substance, which is the basis for bird's nest soup. Other swifts select holes and small cavities in walls. [15] The eggs hatch after 19 to 23 days, and the young leave the nest after a further six to eight weeks.
The lesser swallow-tailed swift's breeding season varies geographically, with nesting generally in the local spring and summer. The nest is tubular, wider at the top, and with the entrance at its base. It is made of plant material felted with saliva and attached to a branch or a vertical surface.
The nests of Aerodramus swiftlets are constructed with saliva as a major component. In two species, saliva is the only material used, and the nests are collected for the famous Chinese delicacy ' bird's nest soup ', the over-collection of which puts pressure on the swiftlet populations.