Polar bear noses are highly attuned sensory organs that put a blood hound’s sniffer to shame — when detecting the next meal, anyhow. A polar bear can track an icebound seal up to 20 miles (32 kilometers) away, and can sniff-out a seal’s breathing hole in the ice more than half a mile away, even if the seal is absent. That must be quite the tease at zoos when a polar bear’s lunch might just be a few hundred feet away, yet always unattainable.
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