How Can Birds Fly 13,560 KM Without Eating or Resting?
April 6, 2026
The bar-tailed godwit holds the world record for the longest nonstop migration, flying 13,560 kilometers from Alaska to New Zealand without eating, drinking, or landing. This extraordinary feat is achieved through unique physiological adaptations that allow the bird to survive on stored energy for over a week of continuous flight.
The Record-Breaking Journey
Bar-tailed godwits (Limosa lapponica) make this incredible journey annually, crossing the entire Pacific Ocean in a single flight that lasts 8-11 days. Tracked by satellite telemetry, these birds maintain an average speed of 50-60 kilometers per hour while navigating over 13,000 kilometers of open ocean with no landmarks or resting opportunities.
Extreme Physiological Adaptations
To survive this marathon flight, bar-tailed godwits undergo remarkable physical transformations. Before departure, they increase their body weight by up to 55% through intensive feeding, building massive fat reserves that serve as their only fuel source. During flight, their bodies enter a state of controlled starvation where non-essential organs like the liver, kidneys, and digestive tract actually shrink to reduce weight and energy consumption.
Their hearts beat at an incredible 300 beats per minute for the entire journey - a rate that would be fatal for most animals. Meanwhile, their flight muscles remain perfectly preserved, powered by the steady breakdown of stored fat through highly efficient metabolic processes.
Navigation and Sleep Strategies
Perhaps most remarkably, these birds can sleep while flying. They enter a state called unihemispheric slow-wave sleep, where one half of their brain sleeps while the other remains alert for navigation and flight control. This allows them to rest without losing altitude or direction over the featureless Pacific Ocean.
Navigation relies on an internal magnetic compass, celestial cues from stars and sun position, and possibly even infrasound detection of distant ocean waves hitting coastlines. This natural GPS system guides them with pinpoint accuracy across thousands of kilometers of open water.
Conservation and Climate Concerns
Climate change poses significant threats to these extraordinary migrants. Rising sea levels threaten their breeding grounds in Alaska and wintering habitats in New Zealand and Australia. Changes in wind patterns and storm frequency along their migration route could make these already demanding journeys even more challenging.
Currently, bar-tailed godwits are listed as near threatened, with populations declining due to habitat loss and human disturbance at critical stopover sites. Protecting these remarkable birds requires international cooperation across their entire migration corridor.
The Limits of Animal Endurance
The bar-tailed godwit’s migration represents one of nature’s most extreme endurance feats, pushing the boundaries of what seems physiologically possible. Their ability to fly continuously for over a week while their bodies literally consume themselves demonstrates the incredible adaptations that evolution can produce when survival depends on crossing vast oceanic barriers.
FREQUENTLY ASKED
How do bar-tailed godwits survive without water during their 11-day flight? ▾
They obtain all necessary water from metabolizing their stored fat reserves, which produces water as a byproduct of the chemical breakdown process.
Do other birds make similarly long migrations? ▾
While many birds make long migrations, the bar-tailed godwit's nonstop Pacific crossing is unique - most other species make shorter legs with regular stops for food and rest.
How do scientists track these birds across the Pacific Ocean? ▾
Researchers attach lightweight satellite transmitters that send location data to orbiting satellites, allowing continuous tracking throughout the entire migration journey.
