Migration, hibernation and food storage are all responses to seasonal changes. As the days become shorter and the nights get longer, hormone changes trigger an animal's instinct to prepare for winter.

The summer season is coming to an end, and with that comes the beautiful fall colors. Every year, leaves change color during the fall season. WRAL meteorologist Elizabeth Gardner said this can be ...

Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer ...