The Avian Parade

Have you ever observed a large number of swallows or grackles congregate and prepare for the “take-off”?  Did you ever listen to the weird honking of geese as they journeyed southward through a cold, bleak, snow-laden sky?  Where do you suppose they were going?  Why? Occasionally, one still hears the query, “Do birds migrate?”  This is not so strange, for centuries ago Aristotle taught that certain species as the European Robin changed to another species as the Redstart with the approach of...