A young bar-tailed godwit has demonstrated one of nature's most remarkable endurance feats, completing a nonstop 13,560-kilometer journey across the Pacific Ocean.
The bird, identified as B6, departed western Alaska on October 13, 2022, and arrived at Anson's Bay in northeastern Tasmania about 11 days later. Throughout the trip, it remained airborne, travelling day and night without stopping to feed, drink or rest on land.
A record tracked from Alaska to Tasmania
A five-gram, solar-powered satellite transmitter enabled researchers to follow B6's route. The bird travelled southwest from Alaska, crossed the Pacific west of Hawaii, continued past the region of Vanuatu and New Caledonia, then turned toward Tasmania rather than following the more typical route to New Zealand.
The route exceeded the previous documented nonstop flight distance for the species by roughly 500 kilometers. B6 was only around four to five months old when it began the migration, making the achievement especially notable for a first southbound journey.
A body designed for extreme distance
Before migration, bar-tailed godwits undergo a striking physiological shift. Research published in Frontiers in Ecology and Evolution indicates that birds preparing for long flights can increase fat reserves to nearly 55% of their body mass while reducing the size of organs that are less essential during an ocean crossing.
This temporary redesign creates an efficient biological flight system. Fat provides concentrated energy and can also generate metabolic water, while flight muscles and the heart are tuned for sustained activity. Favorable wind patterns further help reduce the energy needed to cover immense distances.
Scientists are still examining how godwits navigate so precisely and whether they can take brief sleep periods in flight. The tracking data confirms the journey's uninterrupted nature, but many details of the bird's internal endurance strategy remain open to discovery.
B6's flight highlights how advanced tracking technology can reveal the extraordinary capabilities of wildlife, offering new insights that may shape future research into migration, navigation and biological efficiency.
