Laysan

The world’s oldest known wild bird, a 74-year-old Laysan albatross named Wisdom, is expected to welcome another baby chick in the coming months, astonishing scientists who have been tracking her since the Eisenhower administration.

About 1.3 million of these birds are Laysan albatrosses like Wisdom.

Most Laysan albatrosses only live for 12 to 40 years.

Jon Plissner, supervisory wildlife biologist at the refuge, told BBC Radio 4's Today programme that Wisdom was one of two to three million Laysan albatrosses who travel to Midway to breed.

Laysan albatrosses are not known to breed before the age of five.