It's rare to see an iceberg of this size on the move, said British Antarctic Survey glaciologist Oliver Marsh, so scientists will be watching its trajectory closely.

Tens of thousands of Antarctic penguins are estimated to be unable to return to their colony after a massive iceberg grounded there, according to a newly published study.

Around 150,000 Adélie penguins are killed after a giant iceberg larger than a country grounded at Commonwealth Bay, blocking access to the sea and forcing the penguins to travel considerably longer distances to feed.