Some bar-tailed godwits Limosa lapponica have the longest known non-stop flight of any migrant, flying 11,000 km from Alaska to their New Zealand non-breeding areas. Prior to migration, 55 percent of their bodyweight is stored as fat to fuel this uninterrupted journey.

Answer this question, if possible (if impossible, reply "unanswerable"): How far do bar-tailed godwits travel to migrate?
11,000 km