How do birds stand the cold when they don fly south for the winter?
Birds, like mammals, are warm blooded. They maintain an internal body temperature that is relatively independent of outside temperature. While many birds still try to avoid the cold Michigan winters by migrating south, others choose to stay close to home and brave the weather. As you may have guessed, feathers play a primary role in staying warm enough. Even a small bird may have well over a thousand feathers. Muscles in the bird’s body control the feathers, providing just the right amount of fluffing to keep the bird comfortably warm. Birds also will avoid particularly inclement weather. The thick cover of evergreen branches protects birds from the chilling wind. Some birds also will make dens in hollow tree trunks. Like people, they try to avoid going out if it is too cold. Often, the key to surviving until spring is to find enough food during the sparse winter months. It takes energy to maintain a stable internal body temperature, and when it gets cold it takes more energy. That mea
