# Even Seabirds Get Jet Lag: 20 Years of Tracking Reveal a Hidden Navigation Error

- Link: https://tectonicsmediapublications.com/manx-shearwater-jet-lag-sun-compass-oxford-study-october-30-2026/
- Published: 2026-10-30T20:02:47+00:00
- Author: News Team

**A bird can be on the right journey and still read the sky a little wrong.** New
research tracking Manx shearwaters across the Atlantic suggests that rapid eastward
flights temporarily put the seabirds’ internal clocks behind local solar time. Because
the birds use the sun as a directional reference, that lag produces small but measurable
errors in their flight paths.

The study, published on **October 29, 2026** in the journal _Science_, draws on 
about two decades of GPS records from **1,045 Manx shearwaters** and **3,688 foraging
trips**. Researchers at the University of Oxford and collaborating institutions 
compared actual flight directions with predictions based on how the sun’s apparent
position changes as a bird moves across longitude.

## Why the sun can point the wrong way

Using the sun as a compass is not as simple as flying toward or away from it. Its
position changes throughout the day. A bird must therefore combine what it sees 
overhead with an internal estimate of the time. During a fast flight east, local
sunrise occurs earlier than it did at the departure point; the bird’s body clock
may take time to catch up.

The Oxford team reports that this mismatch can approach **one hour** during homeward
journeys. In an analysis of **335 flights out of sight of land**, observed headings
closely followed the deviations predicted by a clock that had not fully adjusted.
The researchers also found the expected pattern along coastlines, even where landmarks
might have offered another navigation cue.

## A measurable error, not a navigation collapse

The study describes compass errors reaching roughly **15 degrees**, but that does
not mean adult shearwaters routinely become lost. The tracked birds appear able 
to correct their course as they travel. The researchers calculated that a bird returning
from about 1,000 kilometres away with a typical seven-degree error could add only
about five kilometres to its route if it keeps correcting its position.

That distinction matters. The research provides evidence of an internal-clock effect
on navigation; it does **not** demonstrate widespread failed migrations, harm to
the birds’ health or human-like symptoms such as exhaustion. The possibility of 
larger accumulated errors in less experienced migrants is a hypothesis requiring
further investigation, not an outcome established in these tracked adults.

## What the finding changes

The result strengthens a view of animal navigation as a combination of systems rather
than a single infallible compass. A seabird may use a map-like sense to establish
where home is and still rely on a time-sensitive solar compass to choose a heading.
The fact that the predicted deviations persist near visible coastlines suggests 
that familiar geography does not automatically override the sun cue.

It also offers a way to study biological clocks outside a laboratory. Researchers
can compare naturally occurring journeys with astronomical predictions instead of
deliberately changing a bird’s clock. Whether repeated clock shifts affect feeding,
resting or survival remains unknown.

_Featured image: illustrative bird over the sea, photographed by [Michael Geyer](https://unsplash.com/@mgeyerphotography)
via Unsplash. It does not depict an identified Manx shearwater from the study._

## Sources and further reading

 * [University of Oxford, October 30, 2026 — research announcement and methods summary](https://www.ox.ac.uk/news/2026-10-26-study-finds-that-long-distance-flights-can-throw-seabirds-internal-clocks-out-of)
 * [Lewin and colleagues, _Science_, October 29, 2026 — original research](https://doi.org/10.1126/science.adz2542)
 * [Reuters, October 30, 2026 — independent reporting and researcher interviews](https://www.reuters.com/science/long-distance-flights-can-interfere-with-internal-clocks-seabirds-2026-10-30/)

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