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9 613
The Arctic fox can survive even in temperatures below −50 °C (−58 °F) thanks to one of the warmest fur coats in the animal kingdom. In winter, it also wraps its fluffy tail around its body like a blanket to stay warm.
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The Australian echidna carries its single egg in a special skin pouch on its belly. After hatching, the baby stays with its mother for several more weeks, drinking milk directly from mammary patches because echidnas do not have nipples.
