While the A23a represents a threat to the penguin colony on South Georgia, it doesn't pose a greater risk to the overall penguin populations, University of Colorado ice scientist Ted Scambos said.
The world's largest iceberg is on a collision course with the British territory of South Georgia - potentially putting millions of penguins and seals in danger.
If the iceberg gets wedged in the shallow waters close to the island, it could block vital pathways for penguins to get food for themselves and their chicks.
That could "dramatically increase mortality rates" among penguins, according to British Antarctic Survey physical oceanographer Andrew Meijer - something that has happened in the past.
It's a breeding ground for a huge number of penguins, millions of penguins and seals," Mr Meijers said.
