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Photo taken on Oct. 10, 2017 shows a pair of swallow-tailed gulls on the South Plaza Island, one of the Galapagos Islands, in Ecuador. (Xinhua/Xu Rui)
Photo taken on Oct. 10, 2017 shows a pair of swallow-tailed gulls on the South Plaza Island, one of the Galapagos Islands, in Ecuador. (Xinhua/Xu Rui)