Some species of birds have edible nests. The most heavily harvested nests are from the White-nest swiftlets.
The nests are built during the breeding season by the male swiftlet over a period of 35 days. They take the shape of a shallow cup stuck to the cave wall. The nests are composed of interwoven strands of salivary laminae cement. Both nests have high levels of calcium, iron, potassium, and magnesium.
Birds nest soup is a expensive delicacy in China. The Chinese usually put the nests in a soup, to eat as a starter.
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