Hibernate during winter to conserve energy.
Enter a state of torpor to survive the cold.
Some species hibernate in caves during winter.
Undergo a deep sleep known as torpor.
Freeze during winter and thaw in spring.
Hibernate to endure winter conditions.
Cluster together for warmth during winter.
Enter brumation, a reptilian form of hibernation.
Group together for warmth during hibernation.
Experience a deep hibernation-like state.