Nature's Hacks: 10 Amazing Cold-Busting Animal Adaptations.

10. Reindeer: Ultraviolet Vision and Eating While Asleep

9. Bears: Recycling Urine

8. Snakes: Brumation

7. Fish: Natural Antifreeze

6. Wood Frogs: Freezing but Surviving

5. Antarctic Midges: Rapid Cold Hardening

4. Snow Flies: Self-Amputation

3. Bacteria: Transporter Cells and Cold-Active Enzymes

2. Himalayan Songbirds: Thick Feathers and Elevation Boundaries

1. Ducks: Counter-Current Heat Exchange