They're generated by underwater landslides and earthquakes
Known as tsunamis,
they can flatten coastlines
Yet these destructive forces may have also brought life to some islands
As tsunamis strike the coast,
rafts of vegetation could be cast adrift
Perhaps animals were caught up in those rafts too
Could this have been the answer to how these animals made it to Fiji?
After all, they are the hardest of their kind and could have survived long sea journeys
Fiji's first animals washed up tens of millions of years ago
But humans were slow off the block
They only arrived here three and a half thousand years ago
Their history remains thin on the ground
The ruins of Nan Madol are one of only two ancient cities ever found in the Pacific
With archaeological evidence so scarce,
the origins of the first people in the central Pacific were hotly debated
Were they Papuans From New Guinea,
native Indians from the Americas,
or another race of people from Asia