The nest is made of saliva secreted by some of the swiftlets of the swiftlet family and several species of swiftlets of the swiftlet genus, and then mixed with other substances to form a nest. The so-called "Blood Swallows" on the market are rumored to be made from artificially farmed swiftlets through the "guano fumigation method".

Bird's nests are mainly found in the caves of deserted islands near the coasts of Myanmar, Indonesia, Malaysia, Sandakan, Singapore, Thailand and other Southeast Asian seas and islands in the South China Sea.

/iknow-pic.cdn.bcebos.com/9e3df8dcd100baa15aa66de34910b912c9fc2edb "target="_blank "title="" class="ikqb_img_alink">/iknow- pic.cdn.bcebos.com/9e3df8dcd100baa15aa66de34910b912c9fc2edb?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2CCh_800%2Climit_1% 2Fquality%2Cq_85%2Fformat%2Cf_auto "esrc="/GB/n2/2017/0512/c134819-30174788.html "target="_blank "title="People's Daily Online - Bird's Nest although good is not for everyone to eat which type of people should not eat bird's nest"> People's Daily Online - Bird's nest is not good for everyone which type of people should not eat bird's nest