The American scientist, A Cressy Morrison, Head of the Science Academy in New York, says in his book "Man Does Not Stand Alone": Birds have the homing instinct. The robin that nested at your door may go south in the autumn, but will come back to his old nest the next spring. In September, flocks of many of our birds fly south,often over a thousand miles of open sea, but they do not lose their way. The homing pigeon, confused by new sounds on a long journey in a closed box, circles for a moment then heads almost unerringly for home. The bee finds its hive while the wind waving the grasses and trees blots out every visible guide to its whereabouts. This homing sense is slightly developed in man, but he supplements his meagre equipment with instruments of navigation. We need this instinct and our brain provides the answer. The tiny insects must have microscopic eyes, how perfect we do not know, and the hawks, the eagle and the condor must have telescopic vision. Here...