It's a parrot

And weighing up to four kilos

It's the world's heaviest

And yes you've guessed it

It can't fly

Meet the kakapo

Too heavy and short-winged to get airborne

It climbs trees instead

Kakapo were once one of the most successful

And abundant herbivores in New Zealand

The Kiwi equivalent of our rabbit

In 1899 explorer Charlie Douglas wrote

''They could be caught in the moonlight by simply shaking the tree

Or bush until they tumbled to the ground

Like shaking down apples''

Its favourite food is up above

The tiny seeds of the rimu tree

This fruit fuels kakapo reproduction

And they only breed when the trees produce a bumper crop

So about once every four years

Kakapo breed slower than any other bird

But they also live longer

Sometimes more than a hundred years

The male's song'' is as peculiar as the bird itself