GWR said the record was previously set in 2020 by another member of the same species and this year's godwit broke the record by 217 miles.
Eric Woehler of Birdlife Tasmania told Guinness World Records the record-breaking bird probably lost "half or more of its body weight during continuous day and night flight."
"Short-tailed shearwaters and mutton birds can land on the water and feed. If a godwit lands on water, it's dead. It doesn't have the webbing in its feet, it has no way of getting off. So if it falls onto the ocean's surface from exhaustion, or if bad weather forces it to land, that's the end," he said.