In the middle of the south Atlantic ocean sits the tiny 91 square kilometre Gough Island (pictured), a British Overseas Territory. On the island millions of sea birds nest and raise their chicks.
But the birds’ survival is threatened by a race of super-sized mice who have learned to eat the eggs and the chicks. The mice first landed on the island in the early 19th century, transported by a passing vessel.
The plan now is to use helicopters to spead mice-killing poison.
Picture source: Steven Chown