Manx Shearwaters Experience Navigational Jet Lag During Homing Flights
A new Science study reported by Ars Technica reveals that Manx shearwaters experience jet lag that skews their internal Sun compass. By analyzing twenty years of GPS tracking data, researchers from the University of Oxford demonstrated that rapid longitudinal travel causes these seabirds to misjudge the Sun’s position, leading to measurable flight path deviations.
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The study highlights the biological constraints of the Sun compass, a navigational tool shared by many migratory species. While previous experiments involved artificially moving penguins to different longitudes, this Oxford research confirms that natural foraging behaviors are sufficient to induce physiological desynchronization. The Manx shearwater’s reliance on dawn and dusk for recalibration makes it particularly susceptible to longitudinal errors during the long homing stretches that follow days of erratic foraging. The fact that the birds maintain high accuracy despite these errors points to a sophisticated redundancy in avian navigation, where celestial cues are constantly cross-referenced against a map sense, possibly derived from olfactory or landmark data.
Research led by Patrick Lewin of the University of Oxford has identified a biological clock synchronization issue in Manx shearwaters. According to Ars Technica, these medium-sized seabirds recalibrate their internal clocks at every dawn and dusk. When they travel hundreds of kilometers across the North Atlantic, their internal timing falls out of sync with local time by four minutes for every degree of longitude covered. This discrepancy creates a form of jet lag that directly impacts their ability to navigate using the Sun.
The study utilized a massive dataset consisting of 3,688 foraging trips recorded since 2004. As Ars Technica reports, researchers isolated homing flights, which are characterized by high-speed, straight-line travel. By comparing the birds’ actual paths to predicted Sun compass errors, the team found that the birds veered clockwise when flying east and anticlockwise when flying west. These deviations matched the expected errors calculated from their internal clock shifts rather than other factors like wind or magnetic fields.
While the time shifts were often as small as ten to fifteen minutes, they resulted in navigational errors of up to 15 degrees. However, the birds possess a secondary map sense that allows them to notice these drifts and correct their course. Ars Technica notes that even a 1,000-kilometer journey only adds about five kilometers to the total trip because the birds frequently check their position against their destination.
The findings suggest that birds may rely on multiple parallel navigation systems. Even when following familiar coastlines, the shearwaters showed slight drifts consistent with Sun compass errors. This indicates that while they use landmarks, they do not entirely abandon their celestial orientation tools. This research marks the first time such jet-lagged behavior has been clearly documented in wild animals navigating independently in their natural environment.
The Industry Pulse Bottom Line
Manx shearwaters experience a natural form of jet lag that skews their Sun-based navigation. However, a redundant map-sense system allows these birds to correct their course, minimizing the energy costs of these internal timing errors.