Geese sign of early spring at Lalu Wetland, Tibet

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Bar-headed geese are seen flying above Lalu Wetland in Lhasa, Southwest China's Tibet autonomous region, Feb 24, 2020. The temperature here in Lalu Wetland Reserve rises with the arrival of spring, and wild birds become active again after a bleak winter, revealing a lively spring landscape. Lalu Wetland, known as "the Lungs of Lhasa", is a unique urban inland natural wetland with the highest altitude and largest acreage.[Photo/Xinhua]

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Bar-headed geese are seen flying above Lalu Wetland in Lhasa, Southwest China's Tibet autonomous region, Feb 24, 2020. The temperature here in Lalu Wetland Reserve rises with the arrival of spring, and wild birds become active again after a bleak winter, revealing a lively spring landscape. Lalu Wetland, known as "the Lungs of Lhasa", is a unique urban inland natural wetland with the highest altitude and largest acreage.[Photo/Xinhua]

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The temperature in Lalu Wetland Reserve rises with the arrival of spring, and wild birds become active again after a bleak winter, revealing a lively spring landscape. Lalu Wetland, known as "the Lungs of Lhasa", is a unique urban inland natural wetland with the highest altitude and largest acreage.[Photo/Xinhua]

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The temperature in Lalu Wetland Reserve rises with the arrival of spring, and wild birds become active again after a bleak winter, revealing a lively spring landscape. Lalu Wetland, known as "the Lungs of Lhasa", is a unique urban inland natural wetland with the highest altitude and largest acreage.[Photo/Xinhua]

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The temperature in Lalu Wetland Reserve rises with the arrival of spring, and wild birds become active again after a bleak winter, revealing a lively spring landscape. Lalu Wetland, known as "the Lungs of Lhasa", is a unique urban inland natural wetland with the highest altitude and largest acreage.[Photo/Xinhua]