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(190310) -- BEIJING, March 10, 2019 (Xinhua) -- A flock of Grus grus are seen within the Agamon Hula Ornithology and Nature Park in northern Israel, on March 8, 2019. Every year, hundreds of millions of wintering birds migrate from Europe to Africa by way of Israel. The Hula Valley in northern Israel provides the passing birds with a relatively warm and humid environment as well as sufficient food sources. (Xinhua/Guo Yu)