漂流者 18

Discovered only 30 years ago,

Fiji's largest surviving reptile was marooned on a handful of its outer islands

Crested iguanas

They're one of the toughest and most saltwater-tolerant lizards around

In the breeding season,

males, nearly a metre long battle it out for a mate

They begin with a gentle bout of competitive head-bobbing

If no-one backs down, things become more animated

The loser scrambles for cover

So where did these large lizards come from?

Some speculate Asia, 4,000 miles to the west,

others, the Americas, 5,000 miles to the east

But how did they end up here in Fiji?

One answer is that the iguanas, the frogs and the millipedes were all carried here by powerful oceanic forces

Every day, large waves beat down on tiny islands across the Pacific

Imposing as they may be,

these have little impact on island life

But every year, much larger waves rise out of the ocean