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。
Old World gooselike duck slightly larger than a mallard with variegated mostly black-and-white plumage and a red bill.
东半球象鹅的鸭子，比野鸭稍大，多数为黑白杂色羽毛，红嘴。
Old World gooselike duck slightly larger than a mallard with variegated mostly black-and-white plumage and a red bill.
东半球象鹅的鸭子，比野鸭稍大，多数为黑白杂色羽毛，红嘴。
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