冰雪世界 9

It's imperative they reform as quickly as possible

for only by acting as one can the males withstand the elements

and protect their eggs

But their greatest test lies ahead

As winter advances

frequent blizzards drive the temperature down

It's now 60 degrees below zero

The birds at the edge of the huddle bear the brunt of the hundred-mile-an-hour winds

and so provide shelter to those taking their turn in the middle

Abandoned by the sun the males are left alone with their eggs

to face the coldest darkest winter on earth

At the northern extreme of our planet

the sun rises for the first time in months

illuminating a very different ice world