This chapter explains how beavers spend their time on a typical day. Three factors determine when a beaver is active and when it rests: exposure to the natural light cycle, air temperature, and season. Beavers stay in their lodge during the day, from about 0800 to 2000 hours in the summer in northern latitudes. During the first part of the night they feed, and during the second half they construct dams and lodges. The beaver can decouple its daily activity rhythm from the natural 24-hour light cycle. It shows a free-running activity period that is much longer than 24 hours. In summer, beavers are synchronized with the 24-hour day. In winter, above-ice activity ceases at certain critical low temperatures.
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