Study: Manx Shearwaters' Sun Compass Skews Up to 15 Degrees From Bird Jet Lag

2.0 · 15h ago · WORLD · TECH

The Facts

  • A study published in Science found that Manx shearwaters experience jet lag-like clock mismatch during long east-west flights, which skews their Sun-compass navigation. Ars Technica only
  • The dataset comprised 3,688 foraging trips by 1,045 birds from colonies on the UK's western coasts, tracked with GPS tags since 2004. Ars Technica only
  • The analysis covered 335 homing flights made out of sight of land, in which the birds veered as Sun-compass predictions said they would. Ars Technica only
  • Navigational errors apparently caused by jet lag reached up to about 15 degrees; observed time shifts were at most about one hour, mostly 10 to 15 minutes. Ars Technica only
  • The birds recalibrate their internal clock at each dusk and dawn, so for every degree of longitude covered between sunrise and sunset the clock falls four minutes out of sync with local time. Ars Technica only
Dive deeper · 3 more factsShow less
  • The researchers calculated biases from crosswinds, the Coriolis effect, or a magnetic compass and found none fit the data well; lead author Patrick Lewin of the University of Oxford said the observed biases best matched Sun-compass predictions. Ars Technica only
  • The study was not a controlled experiment, so Lewin cautioned against firm conclusions about causality. Ars Technica only
  • Most Manx shearwaters breed around the UK and Ireland, with about half the population in Wales; they forage from a few dozen to over 1,000 km into the Atlantic, and trips last from one day to two weeks. Ars Technica only

Context

A Science study led by Patrick Lewin of the University of Oxford used two decades of GPS tracking data to examine how Manx shearwaters navigate home. The birds are thought to use a map sense to determine location and the Sun as a compass, which requires an internal clock.

Because the birds' clock resets at dawn and dusk, flying east or west puts it out of step with local time, biasing their heading. Earlier work had shown similar effects in penguins that were moved across longitudes, but not in wild animals moving on their own.

The article's text was truncated; it indicates the errors were less costly than expected because birds with a map sense can notice drift and correct.

How the Agent Panel Scored This

Independent AI personas each scored importance 1–10; the story's score is a trimmed mean (highest and lowest votes dropped). Vote spread: 0.

2 Business Analyst This is a niche wildlife navigation study with no market, economic, or regulatory impact, reporting a scientific finding about seabird behavior.
2 News Editor This is a niche animal-navigation science study with no broad human impact, reporting a single research finding published in one journal.
2 Informed Citizen This is a niche animal navigation study with no direct impact on ordinary people and limited relevance beyond ornithology, so it scores low.

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