一只小鸟告诉我。。。(A little bird told me...)

红脖子的格雷布有点个性分裂——事实上，它只有半年左右的时间名副其实。当它在欧洲和北美海岸的海水中过着平静的生活时，整个冬天它的羽毛不是红色的，而是棕色和灰色的。但是，就在它迁徙到北边的湖泊、池塘或沼泽地进行繁殖季节之前，格雷贝喉咙周围的羽毛变成了独特的锈红色。雄性和雌性都会经历羽毛的变化。
原文：
The red-necked grebe has a bit of a split personality - in fact, it only lives up to its name for about half the year. Its feathers are not red but brambly brown and grey throughout the winter, when it lives a quiet life in ocean waters along the European and North American coasts. But, just before it migrates to a northerly lake, pond or swamp for breeding season, the plumage around the grebe's throat turns a distinctive rust-red. Both males and females undergo the plumage change.
《© Edo van Uchelen/Minden Pictures》