It is the time of year that each of us begin to prepare our homes, cars, and other belongings for the winter ahead. We do this by such things as changing antifreeze in radiators, getting out snow or studded tires, checking insulation in attics, and putting up storm doors or windows. Some people even store additional food so trips to the store will be less and eat a bit extra to add an insulating layer to offset those winter temperatures. All these actions help to make life more pleasant during the long winter ahead. It is interesting to note that nature also prepares for winter.
The first example comes from birds. Most of us are aware that many bird species migrate. Birds migrate for a variety of reasons, but the most important reason is to find a source of unfrozen food. Some species will fly only short distances, while others thousands of miles. Most of us equate this to an inbuilt desire to stay warm, which is important, but food is the source of energy that sustains life.