Earth is a planet of extremes. However, animals have developed to thrive in seemingly uninhabitable environments. In the freezing world of the Arctic, the polar bear has a coat of fur to cope with interminable winters. Mountain goats have developed their lungs to take advantage of thin air and bats have extraordinarily sensitive hearing to navigate in the darkest caves. Finally, in the mysterious deep of our oceans, fragile jellyfish are gelatinous enough to thrive in extreme water pressure.