The Antarctic fur seals' remarkable homing instinct, which is thought to be
the most accurate of any sea mammal, allows the creatures to return to
within a single body length of the spot where they were born to give birth
to their own pups.
Nearly four million of the sea mammals breed in huge colonies on the virtually
featureless beaches of South Georgia every year. After being born, the seals
spend five years out at sea feeding before returning to the island to breed.
Using radio tags placed on 335 seals shortly after they were born, researchers
at the British Antarctic Survey have discovered that each seal returns to
exactly the same location on the beach once they start breeding year after
year.
But while typical human Global Positioning Systems (GPS), which use satellites
orbiting the earth, can pinpoint a location to an accuracy of around 15
feet, the seals were found to be accurate down to as little as six feet. link
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