The article examines the endurance of the migrating birds called bar-tailed godwits, which take a transpacific flight from Alaska to New Zealand every spring. Biologists believed that these birds have crossed the two places in a single non-stop flight. Biologist Robert E. Gill, who fitted satellite tags to godwits in 2006, has found out that a godwit could fly 11,680 kilometers in about eight days. Information about the structural changes in the bird's body organs is also provided.