一群灰鹤在芦苇湿地上空翱翔（12月6日摄）。进入冬季，地处黄河三角洲的山东滨州海防芦苇湿地迎来大批前来越冬的灰鹤。近年来，随着《黄河三角洲高效生态经济区发展规划》的实施，黄河三角洲湿地生态环境得到明显改善，每年迁徙、越冬的候鸟达到600万只。新华社记者 朱峥 摄     A group of grey crane in the reed wetland soar above(On December 6, taken).Enter winter,Is located in the Yellow River delta coastal shandong binzhou reed wetland have large to winter grey crane.In recent years,as[The Yellow River delta efficient ecological economic zone development planning]implementation,The Yellow River delta wetland ecological environment have been improved obviously,Annual migration/Winter migratory birds reach 6 million only.The xinhua news agency ZhuZheng perturbation

一群灰鹤翱翔在芦苇湿地上空（12月6日摄）。新华社记者 朱峥 摄 A group of grey crane fly over the reed wetlands(On December 6, taken).The xinhua news agency ZhuZheng perturbation

一群灰鹤在芦苇湿地内休息（12月6日摄）。新华社记者 朱峥 摄 A group of grey crane in the reed wetland in rest(On December 6, taken).The xinhua news agency ZhuZheng perturbation

一群灰鹤准备降落（12月6日摄）。新华社记者 朱峥 摄 A group of grey crane prepared to land(On December 6, taken).The xinhua news agency ZhuZheng perturbation

一群灰鹤翱翔在芦苇湿地上空（12月6日摄）。新华社记者 朱峥 摄 A group of grey crane fly over the reed wetlands(On December 6, taken).The xinhua news agency ZhuZheng perturbation

一群灰鹤翱翔在芦苇湿地上空（12月6日摄）。新华社记者 朱峥 摄 A group of grey crane fly over the reed wetlands(On December 6, taken).The xinhua news agency ZhuZheng perturbation