大多数水鸟的捕食者都有机会捕食鸣禽的巢穴，而消灭这些捕食者可以直接提高鸣禽筑巢的成功率。
Most predators of waterfowl nests prey opportunistically on songbird nests, and removing these predators could directly increase songbird nesting success.
先用沙丘鹤做试验，是因为高鸣鹤实在太罕见。
Sandhill cranes were used in the experiment because whooping cranes are so rare.
先用沙丘鹤做试验，是因为高鸣鹤实在太罕见。
Sandhill cranes were used in the experiment because whooping cranes are so rare.
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