Bird's nest and egg can be eaten together. Bird's nest has the effect of nourishing yin and moisturizing dryness, benefiting qi and tonifying the middle. Eggs have the effect of nourishing the essence and tonifying the qi, moisturizing the lungs and pharynx, nourishing the yang and moistening the dryness, and nourishing the blood. Eating bird's nest and egg together has the effect of benefiting the essence and tonifying the qi, moistening the lungs and pharynx, nourishing the yang and moistening the dryness and nourishing the blood, nourishing the yin and moistening the dryness and benefiting the qi and tonifying the middle. Bird's nests can be classified into two types according to the nesting place, namely "House Swallows" and "Cave Swallows". Cave Swallows are different in color due to the influence of minerals, and there are white, yellow and red swallows, while House Swallows are only available in one color, ivory white. Bird's nest is one of the traditional and valuable foods that have been consumed in China since the Ming Dynasty. The so-called "blood bird's nests" on the market are rumored to be made from artificially farmed swiftlets through the "bird dung fumigation method".

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