Do Penguins Have Feathers or Fur?
Penguins have feathers, not mammal fur. Their feathers are dense, help with insulation and waterproofing, and are replaced during moult.
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Why Emperor Penguin Moult Depends on Stable Sea Ice
Emperor penguins cannot swim for weeks during moult; the 2026 Marie Byrd Land satellite study shows why fast-ice risk is not only a breeding-season problem.
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Penguin Catastrophic Moult: Why They Replace Feathers at Once
Catastrophic moult leaves penguins unable to swim or feed for 2 to 4 weeks, so the whole annual cycle depends on fat stores and a safe window on land or ice.
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