The Chinese have served bird's nest soup, considered a delicacy, for hundreds of years. It's made using the nests of swiftlets, or cave swifts. The nests are collected by hunters on precariously tall ladders and then dissolved into soup. Said to stimulate cell growth, raise libido and boost the immune system, these edible abodes are among the most expensive animal-food products consumed; they are rare, difficult to harvest and require a labor-intensive cleaning process. Don't feel like dropping the coin to get a taste of the cure-all nectar? Pop a tab on the canned bird's nest drink, and get your vitamins on the go.