They were toys destined only to bob up and down in nothing bigger than a child’s bath – but so far they have floated halfway around the world.
Since then they have travelled 17,000 miles, floating over the site where the Titanic sank, landing in Hawaii and even spending years frozen in an Arctic ice pack.
And now they are heading straight for Britain. At some point this summer they are expected to be spotted on beaches in South-West England.
While the ducks are undoubtedly a loss to the bath-time fun of thousands of children, their adventures at sea have proved an innvaluable aid to science.