Migratory birds
For any human flier, 14,000 kilometers in one stretch would be a challenge. But as birds cross oceans and continents, many species — including endangered ones — pull off this feat without the aid of jet engines.
The long-distance champion
Meet the bar-tailed godwit: Breeding primarily on Arctic coasts, and the Scandinavian and Siberian tundra, this wading species spends the winter in Australia and New Zealand. In 2007, a tagged bird was recorded as having flown 11,600 kilometers (7200 miles), from Western Alaska to New Zealand, in a single nine-day stretch. That probably makes it the record-holder for non-stop flight.
source: http://www.dw.com/en/migratory-birds-the-real-long-distance-champions/g-43744883