Description
卢沟桥畔惊见北方罕见水禽——棉凫，再次证明了气候变化对鸟类栖息地和迁徙的影响。以后北方会看到越来越多的南方鸟类。棉凫是鸭科中体长最瘦小的水鸭，羽毛主要呈白色。头圆，脚短，鸭喙很像鹅的喙，短而底部较深。雄性棉凫繁殖时毛色泛黑绿色光泽，头部、颈部及下身主要呈白色。飞行时，雄鸟双翼呈绿色并有白带，雌鸟羽色较淡。在非繁殖期间，雄鸟的羽毛与雌性的相似。一般生活在河川，湖泊，池塘和沼泽地。在树洞中筑巢。主要吃种子及蔬菜，尤其是睡莲科植物，也吃昆虫、甲壳类等。
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