We have long viewed intercontinental travel—and the annoying fatigue and biological clock disruption known as jet lag that follows—as uniquely human. But did you know that migratory birds face the exact same challenge? In a striking scientific discovery, recent research has proven that birds suffer from this disorder just as we do when covering vast distances at high speeds.
Decades of Tracking Reveal the Secrets of Manx Shearwaters
In the largest study of its kind, scientists relied on precise GPS tracking data for more than 1,000 Manx shearwaters over the course of 20 full years. This accumulated data showed that birds flying at high speeds eastward face clear disruptions in their internal biological rhythms, reaching a time delay of about a full hour, which disrupts their flight navigation efficiency.
How Are Birds’ Natural Sun Compasses Affected?
Migratory birds rely mainly on a precise internal “sun compass” to determine their headings while traveling long distances. When rapid eastward journeys leave biological clocks running late, it directly affects the bird’s ability to accurately calculate time and the sun’s position. This temporary disruption leads to deviations in their routes, forcing them to gradually reset their natural compass to regain the correct heading.
Stunning Adaptation in the Avian World
Despite the harshness of these sudden shifts in biological timing, these seabirds possess a remarkable capacity for rapid adaptation and recovery. These findings reflect the complexity of the avian nervous and circadian systems, and they open a new door to understanding how modern travel speeds and changing environmental conditions affect living organisms that rely on astronomical timing in their daily lives.
By: Hany Sallam
Source: earth.com
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