With its uniquely shaped bill, the lower mandible is much longer than the upper one, skimmer birds feed on small fish by flying open-mouthed over the surface of estuaries and rivers.

• 剪嘴鸥有着独特的成形鸟喙，它的下颚比上颚长很多。它们大张着鸟喙低飞过河口或河流的水面，捕捉小鱼为食。