As mentioned before, they are typically nocturnal animals that are most active during nighttime. Their days begin at dusk and end at dawn. They spend their day gathering food, building their dam and their lodge, and doing other kinds of work. They are busiest during the fall in preparation for the winter season. It usually takes them a couple of months to finish building their dam. By the time winter begins, most bear species would be in hibernation. The same cannot be said for the beavers. They are still active during winter, albeit staying mostly indoors and swimming underwater to get to their food supply and bring it to their lodge. The insulation they efficiently built into their lodge keeps them safe and warm even when the temperature outside is borderline freezing.