You might think life as a penguin is all about keeping warm in freezing cold temperatures, but cooling down in the sunshine is just as important.
A group of king penguin chicks have been caught bathing in a load of mud to do just that.
Summer temperatures in St Andrews Bay, South Georgia, can reach 17C so the birds use streams and thick, cooling mud to stop their large, fluffy bodies from overheating.
They were filmed for the Frozen Planet series. The crew said that although they were expecting to see the chicks paddling in rivers and streams, their mud-bathing display was "unexpected".
You can see more on the BBC's Frozen Planet series on Sunday, at 4.10pm, on BBC One.