The brown bear is often described as nocturnal. However, it frequently seems to peak in activity in the morning and early evening hours. Studies have shown that activity throughout the range can occur at nearly any time of night or day, with bears who dwell in areas with more extensive human contact being more likely to be fully nocturnal.
In summer through autumn, it can double its weight, gaining up to 180 kg (400 lb) of fat, on which it relies to make it through winter, when it becomes very lethargic.
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