Final answer:
Animals curl in a circle during winter to conserve body heat by maintaining a reduced body temperature, especially during hibernation or torpor.
Explanation:
Animals curl in a circle during winter as a mechanism for conserving body heat. This behavior helps them maintain a reduced body temperature, especially when entering a state of hibernation or torpor. For example, ground squirrels can achieve an abdominal temperature of 0°C during hibernation.
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