Thousands of species have humans to thank for

Bringing them to islands throughout the Pacific

But there's one animal that has been a valued travelling companion

For as long as people have sailed this ocean

Wherever people went

Pigs went too

In Vanuatu

1 200 miles north of New Zealand

The people of Tanna Island have gathered for a festival

Like an expensive car in Western culture

Here pigs are a symbol of wealth and status

The Toka festival celebrates the end of warfare between rival clans

And pigs are at the centre of it

To attend each village must bring some to the party

That's a lot of pigs

Some will be butchered for a feast

Others given away

But to take one of these pigs home

A family must agree to one day repay the debt

And it's these pig debts that help strengthen the bonds

Between the different villages