Little wonder the Federal Duck Stamp Program has been called one of the most successful conservation programs ever initiated.

难怪联邦鸭票被称为有史以来最成功的自然保护计划之一。

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Under this Act, all waterfowl hunters 16 years of age and over must annually purchase and carry a Federal Duck Stamp.

根据这项法案，所有16周岁及以上的水禽狩猎者必须每年购买并持有一枚联邦鸭票。

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The very first Federal Duck Stamp was designed by J.N. "Ding" Darling, a political cartoonist from Des Moines, Iowa, who at that time was appointed by President Franklin Roosevelt as Director of the Bureau of Biological Survey.

最早的联邦鸭票是由J.N.“丁”·达林设计的，他是爱荷华州得梅因市的一位政治漫画家，当时被富兰克林·罗斯福总统任命为生物调查局局长。

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More than two million hunters paid for a "duck stamp, " a federal licence to shoot the creatures in the 1970s.

BBC: Just quackers: Hunting decline lands ducks in the soup