Here, there are other challenges.
St Andrews Bay on South Georgia
is packed with half a million king penguins.
In spring,
the chicks are left for days
whilst their parents are away
collecting food for them.
There is a simple arrangement.
The chicks must stay exactly
where their parents left them
to be sure of being found again.
But this chick
has decided to look around.
There is a lot to be investigated.
But it must not stray too far
from its meeting place.
This parent has returned with food in its crop,
but its chick isn't where it left it.
It's hard to stay put
when there's so much to play with.
Elephant seals are here too.
Very mysterious.
Finding it in the crowd of youngsters
is not going to be easy.
They must recognise each other
by their calls.
But to hear these in such a noisy colony,
they must be within 15 metres of each other.
Reunited.