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Migratory birds seen in China's wetlands before heading north
01:12

The migratory swans are leaving their winter habitats and flying northwards as the weather turns warm across China. At present, nearly 2,000 swans sometimes fly in the sky and forage and play in the Sanmenxia Swan Lake State Urban Wetland Park in Sanmenxia City, central China's Henan Province. Meanwhile, flocks of whooper swans have be seen playing and swimming in the Longhuakou Reservoir in Yangquan City of north China's Shanxi Province.

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