Kelly Shaw, age 10, of Portage, Ind., for his question:

WHERE DO FROGS GO IN WINTER?

Frogs are amphibians, and all amphibians are cold blooded. This means that their body temperatures tend to be the same as the temperature of the surrounding air or water.

Those frogs that live in regions with cold winters hibernate. Some will hibernate in burrows while others will spent the winter buried in mud at the bottom of the pond or stream, breathing through their skin.

During a frog's period of hibernation, he lives off the materials stored in his body tissues.

Scientists say the frog was here on earth for about 180 million years. More than 2,000 species of frogs and toads have developed from the first ones.