These bird nests sell for such a high price in China that huge bird hotels have sprung up to harvest the 'caviar of the East'

These bird nests sell for such a high price in China that huge bird hotels have sprung up to harvest the 'caviar of the East'

Elaine Zhang, owner of the NestCha restaurant, presenting a dried birds nest, made up of swiftlet saliva, in her restaurant in Shanghai on May 23, 2017.JOHANNES EISELE/AFP via Getty ImagesBird hotels in Indonesia try to attract swiftlets, whose edible nests are a delicacy in China.The swiftlet nests, made of dried saliva, are used to make bird's nest soup.Farmers compete to attract the swiftlets by ensuring their birdhouses have the right condit…