Nests of loosely arranged sticks, rocks, or dirt are cooler in temperature at the bottom where the egg contacts the 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。

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And because they're optimized for swimming rather than walking, it's difficult for penguins to gather a lot of soft nesting material.

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。

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Feig and colleagues raised mice, some in plain cases with wood chips and others in "enriched" cages with boxes, a running wheel, toys, and constant rearrangements of nesting material.

菲格及其同事分别在装有木屑的普通盒子和放有盒子、飞轮和玩具等物品的“高级”笼子中培育两组幼鼠。在后一个环境中，研究人员还不停地变换物品的摆放。

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Feig and colleagues raised mice, some in plain cases with wood chips and others in "enriched" cages with boxes, a running wheel, toys, and constant rearrangements of nesting material.

菲格及其同事分别在装有木屑的普通盒子和放有盒子、飞轮和玩具等物品的“高级”笼子中培育两组幼鼠。在后一个环境中，研究人员还不停地变换物品的摆放。

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