Mice appear to have a hotline between their nose and brain that gives them the instinct to flee.
Most of the odors that a mouse encounters in life—the smell of cheddar, for example—become relevant only with experience and learning. But when it comes to the scent of a predator, a mouse has very little room for mistakes.
There may be many chances to consider cheese, but only one to recognize a threat, say researchers at Brown University.
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