UNESCO World Heritage says the Heard Island and McDonald Islands exist "in the complete absence" of human impact.

The Adélie is the littlest, and also the most widespread, species of penguin in the Antarctic. They might look a bit clumsy on land, but penguins are brilliant swimmers. They can dive down to 180m – ...

During the spring breeding season (in October), they take to the rocky Antarctic coastline where they live in large communities called colonies. These groups can include thousands of birds.