Up high, down low, in freezing temperatures, and in boiling hot places--animals and plants can survive in the most extreme environments. Level 2. From boiling heat to bone-chilling cold, from dry deserts to dark caves, from tall mountains to deep seas: these animals survive in the extreme environments. Meet incredible creatures, including polar bears and penguins that endure freezing temperatures, brine shrimp that swim in salty waters, birds that fly higher than airplanes, and even the ancient microscopic "water bear" that could stay alive in outer space!.
