A Hidden Metropolis of 1.5 million penguins has been discovered.

Fiona MacDonald reports at Science Alert,

Scientists have discovered a previously unknown 'supercolony' of Adélie penguins, hidden in plain sight on Antarctica's remote Danger Islands.

There are more than 750,000 pairs of penguins living on the islands - 1.5 million animals in total - which is more than the rest of the Antarctic Peninsula combined.

Read more here.