A young bar-tailed godwit appears to have set a non-stop distance record for migratory birds by flying at least 8,435 miles (13,560 kilometres) from Alaska to the Australian state of Tasmania, an expert has said.

Birdlife Tasmania convenor Eric Woehler said the bird was tagged as a hatchling in Alaska during the Northern Hemisphere summer with a tracking GPS chip and tiny solar panel that enabled an international research team to follow its first annual migration across the Pacific Ocean.

Because the bird was so young, its gender is not known.

Aged about five months, it left south-west Alaska at the Yuko-Kuskokwim Delta on October 13 and touched down 11 days later at Ansons Bay on the island of Tasmania’s north-eastern tip on October 24, according to data from Germany’s Max Plank Institute for Ornithology.

The research has yet to be published or peer reviewed.

The bird started on a south-western course toward Japan then turned south-east over Alaska’s Aleutian Islands, a map published by New Zealand’s Pukoro Miranda Shorebird Centre shows.

The bird was again tracking south-west when it flew over or near Kiribati and New Caledonia, then past the Australian mainland before turning directly west for Tasmania, Australia’s most southerly state.

The satellite trail showed it covered 13,560 kilometres (8,435 miles) without stopping.

Mr Woehler said: “Whether this is an accident, whether this bird got lost or whether this is part of a normal pattern of migration for the species, we still don’t know.”

Guinness World Records lists the longest recorded migration by a bird without stopping for food or rest as 7,580 miles (12,200km) by a satellite-tagged male bar-tailed godwit flying from Alaska to New Zealand.

That flight was recorded in 2020 as part of the same decade-old research project, which also involves China’s Fudan University, New Zealand’s Massey University and the Global Flyway Network.

The same bird broke its own record with an 8,100-mile (13,000-kilometre) flight on its next migrationlast year, researchers say – but Guinness has yet to acknowledge that feat.

Mr Woehler said researchers did not know whether the latest bird, known by its satellite tag 234684, flew alone or as part of a flock.

“There are so few birds that have been tagged, we don’t know how representative or otherwise this event is,” he added.

“It may be that half the birds that do the migration from Alaska come to Tasmania directly rather than through New Zealand or it might be 1%, or it might be that this is the first it’s ever happened.”

Adult birds depart Alaska earlier than juveniles, so the tagged bird was unlikely to have followed more experienced travellers south, Mr Woehler said.

The expert hopes to see the bird once wet weather clears in the remote corner of Tasmania, where it will fatten up having lost half its body weight on its journey.