美国鱼类和野生动物管理局表示，自1990年来，近十亿只帝王蝶在越冬地点消失了。

The US Fish and Wildlife Service said that nearly a billion monarchs have disappeared from overwintering sites since 1990.

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尽管如此，野生动物管理局还是批准了许可证。

Nevertheless, the wildlife agency approved the permits.

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美国鱼类和野生动物管理局对黄石公园的狼群进行了仔细的监控和管理。

The US Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone.

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