In this photo taken on Friday, March 4, 2011, pedestrians walk past a swiftlet farm building which is converted from a heritage building in Penang island, northwestern Malaysia. Tens of thousands of birds cultivated for their edible nests are being banned from the capital of the Malaysian tourist island after the U.N.'s cultural agency warned that the business endangered efforts to preserve decades-old buildings. (AP Photo/Gary Chuah)
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