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仲春时节，在甘肃省陇南市白龙江畔，国家“三有”保护动物苍鹭进入了繁育高峰期。殷冬 摄


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图为已经破壳而出的雏鸟。殷冬 摄


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巢穴之中，苍鹭静静守护鸟蛋。殷冬 摄


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苍鹭对栖息环境的水质、植被、生态安全度要求极高，是衡量生态环境质量的标志性鸟类之一。殷冬 摄


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苍鹭是衡量生态环境质量的标志性鸟类之一。殷冬 摄


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苍鹭是衡量生态环境质量的标志性鸟类之一。殷冬 摄


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图为苍鹭忙着衔取树枝，加固巢穴。殷冬 摄