Do Migrating Birds Have Gps

THERE ARE MANY THINGS I'D SURE LIKE TO KNOW. BECAUSE CURIOSITY CONTINUALLY GROWS DO MIGRATING BIRDS HAVE GPS ? OR IS THEIR SENSE OF DIRECTION SIMPLY THE BEST. INTUITION OR INSTINCT HOW DO THEY KNOW.? OF ALL THE DIRECTIONS WHICH WAY TO GO? MIGRATION TAKES PLACE WE KNOW THERE'S A REASON. BUT HOW CAN THEY TELL IT'S TIME OR THAT SEASON.? THEY ARRIVE EVERY YEAR. ON THE VERY SAME DAY. ISN'T IT ODD IN SOME KIND OF WAY.? ARE THEY COUNTING THE DAYS? OR COUNTING THE NIGHTS.? MAYBE THEY'RE COUNTING THEIR HOURS IN FLIGHT. AS IT TURNS OUT OR AS SCIENTISTS SAY. MAGNETIC FIELDS PROVIDE THEM THE WAY GEOMAGNETIC FIELDS ARE A MAP. THEY FOLLOW THE FIELDS AND ALWAYS COME BACK Michael E Harris 09171021