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在苏格兰的爱丁堡， 淡紫色的天空下，一群哑天鹅在群山环绕的湖面上静静地划过。顾名思义，因其直气管所限，哑天鹅大多数时候都保持安静。不过哑天鹅偶尔会发出呼哧声，嘘声，或吼声。这种优雅的疣鼻天鹅(Cygnus olor)大多数情况下都通过肢体语言进行交流。

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Brooding skies cast a lavender glow on a flock of mute swans gliding across a crag-ringed loch in Edinburgh, Scotland. As their name suggests, mute swans are usually silent, limited by a straight trachea. However, they occasionally snort, hiss, or bark. The graceful Cygnus olor communicates mostly through visual displays and postures.

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