十万个为什么·科学阅读30篇（5）
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How Do Penguins Stay Warm in Icy Water?
企鹅如何在冰冷海水中保持温暖？
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Penguins have thick layers of fat under their skin for insulation.企鹅皮肤下有厚厚的脂肪层，用于保温。
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Their feathers trap air like tiny warm pockets next to skin.它们的羽毛紧贴皮肤形成微小的保暖气囊。
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They huddle close together to share body heat in blizzards.暴风雪中，它们挤在一起共享体温。
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Blood vessels in flippers shrink to hold heat inside.鳍状肢中的血管收缩，减少热量散失。
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Oil from preen glands makes feathers waterproof and windproof.尾脂腺分泌的油脂使羽毛防水防风。
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They swim fast to keep muscles warm while diving deep.它们快速游泳，靠肌肉活动在深潜时保持温暖。
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Tiny muscles let them fluff feathers for extra air trapping.微小的肌肉可使羽毛蓬松，增强空气滞留效果。
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This mix of tools lets them thrive where few animals can.这些适应机制共同作用，让企鹅能在极少动物能生存的环境中繁盛。