Animals live in almost every habitat in the world, from the flaming deserts of the Sahara to the frozen tundra of Antarctica. How do they survive? The key to success for many animals is in their bodies.

Take this place, for instance. Whew! It sure is hot and dry out here! Some animals live where the temperature gets really high and where there is no fresh water to drink. They may have to get their water from the food they eat. Physiological adaptations help them conserve every bit of moisture they get.