Some of you may have heard the news recently about the seventy-year-old albatross that hatched another chick. It got me thinking about the life span of our feathered friends. I have wondered for example if it is the same bald eagle I have been seeing during the spring and fall migration in the same tree on the shoreline of Lake Metigoshe, or the wrens in our birdhouse are the same birds as last year. We may have a tendency to think that some of these birds are the same ones, but that is probably