Why the Fennec Fox Has Giant Ears
The fennec fox is the smallest kind of fox in the world, but its ears are enormous for its size and can look nearly as large as the rest of its head. These ears are not just for decoration, because they help the fox survive in the Sahara desert.
During the day, the Sahara is scorching hot. The fennec fox rests in a burrow it digs in the sand, where it is cooler and shaded from the sun. When the sun goes down, the fox comes out to hunt.
The ears do two jobs. First, they help the fox stay cool. Inside the ears are many tiny blood vessels near the skin, and when warm blood flows through them, extra heat escapes into the air. A large ear has a large surface, so a great deal of heat can leave the body.
Second, the ears are excellent for listening. A fennec fox can hear the faint sounds of small animals, such as insects and lizards, moving on or under the sand, and it then pounces or digs to catch them.
Other parts of the fox are made for the desert too. Its pale fur helps it blend in with the sand, and thick fur on its feet keeps its paws from burning on the hot ground.
Each part of the fennec fox fits its home.