A nest of swallows are seen in a structure in the Beihai Park of Beijing, capital of China, July 11, 2013. (Xinhua/Wang Xibao)
A nest of swallows are seen in a structure in the Beihai Park of Beijing, capital of China, July 11, 2013. (Xinhua/Wang Xibao)
A nest of swallows are seen in a structure in the Beihai Park of Beijing, capital of China, July 11, 2013. (Xinhua/Wang Xibao)
A nest of swallows are seen in a structure in the Beihai Park of Beijing, capital of China, July 11, 2013. (Xinhua/Wang Xibao)
