World's oldest known wild bird has another chick at age of 70

image copyrightJon Brack/Friends of Midway Atoll NWR

image captionWisdom's chick hatched in February

Wisdom the albatross, the world's oldest known wild bird, has had a chick at the age of at least 70.

The Laysan albatross hatched the chick on 1 February in a wildlife refuge in the North Pacific Ocean, the US Fish and Wildlife Service (USFWS) has said.

Laysan albatrosses usually only live for 12-40 years. But Wisdom was first identified by researchers in 1956.

The father is Wisdom's partner, Akeakamai, who she has been with since 2012, US wildlife officials said.

Albatrosses usually mate for life, but it is believed Wisdom had other partners in the past that she outlived.

image copyrightJon Brack/Friends of Midway Atoll NWR

image captionWisdom laid her egg in November

Although Wisdom hatched her chick in February, the birth - which took place in the Midway Atoll national wildlife refuge, in a US minor outlying island in the North Pacific - has only been reported this week.

"Wisdom laid her egg sometime during the last few days of November," the USFWS wrote in its statement announcing the new arrival.

"Soon after, Wisdom returned to sea to forage and her mate Akeakamai took over incubation duties. Albatross parents share incubation duties and once the chick hatches, share feeding duties."

image copyrightJon Brack/Friends of Midway Atoll NWR

image captionAlbatrosses mate for life and share parenting duties

The USFWS believes she has had at least 30 to 36 chicks in her lifetime. Albatrosses only hatch one egg every few years.

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The Midway Atoll wildlife refuge is home to the largest colony of albatross in the world.