MIDAlpha TitleTitleYearColor/BWRunning TimeFormatsAbstractTopics
317BIRD BRAINBIRD BRAIN1976color27 min16mm (Nova series) Birds migrate to insure a continuing food supply and will travel up to 20,000 miles, returning to exactly the same place where their journey began. Birds do instinctively what man has only recently learned to do with the aid of mechanical devices. Birds use coastal routes to navigate. Birds have an instinctive knowledge of wind and weather patterns. Some birds use the stars to navigate at night, while others, on overcast days, rely on the earth's magnetic field to navigate correctly.