蛋被生在横贯湿地的大堤顶，那里合适的筑巢材料比较少。
The eggs were laid on bone dry ground on the top of dikes that traversed the wetlands.
企鹅比较难收集到一些软的筑巢材料，因为它们游泳远比走路擅长。
And because they're optimized for swimming rather than walking, it's difficult for penguins to gather a lot of soft nesting material.
用细棍、石子或泥土松散地搭建的巢穴在筑巢材料与鸟蛋接触的巢底温度是比较低的。
Nests of loosely arranged sticks, rocks, or dirt are cooler in temperature at the bottom where the egg contacts the nesting material.
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