A white North American swan (Olor columbianus) having a soft, musical trumpeting voice and a black beak with a yellow spot at the base.

一种白色北美洲天鹅（哨声天鹅或小天鹅天鹅属） 有柔和、充满乐感的象喇叭似的嗓音，黑喙，底部带有一黄点。

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Beak color gives away a kingfisher's gender: males show mostly black, while females have an orange lower mandible that matches their feet.

喙的颜色可以用来区分翠鸟的性别：雄性的喙大部分是黑色，而雌性的下颌是橙色的，正好同它的脚相配。

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She could see every detail of it clearly: the greedy dark claws, the sharp beak, the single glittering black eye.

她可以看清楚它身上的每一个细节：蠢蠢欲动的黑色爪子，锋利的嘴，还有一只闪着光的的黑色眼睛。

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With their orange, duck-like feet, black-and-white penguin body and bright red, parrot-like beak, puffins have an irresistible charm, despite their ridiculous appearance when airborne.

BBC: Nature��s biggest treasure hunt