NEW YORK (AP) — Ever wonder how pigeons find their way home? A recent study sheds light on their navigational skills. These birds, known for flying long distances, have puzzled scientists for years about how they navigate without getting lost.
Animals use various tricks to find their way. Some rely on the stars, while others remember landmarks or sense Earth’s magnetic field. However, the exact methods are still a mystery.
Pigeons have been travel companions for thousands of years, carrying messages for humans. Despite this long history, researchers are still unpacking how they do it. Some believe that pigeons detect magnetic cues through special molecules in their eyes. Others suggest their beaks or inner ears play a role. “The magnetic sense has been this mystery for almost 100 years,” said Martin Wikelski from the Max Planck Institute of Animal Behavior.
In a new study, Wikelski and his team explored pigeons’ internal navigation systems and made an intriguing discovery: a significant magnetic signal in their livers. The liver contains immune cells that break down red blood cells and store iron. When the researchers temporarily removed these cells, the pigeons struggled to navigate, indicating a link between these liver cells and their sense of direction, according to Christian Kurts from the University of Bonn.
The study also revealed that pigeons depend on the sun when it’s clear but get confused on cloudy days. This finding brings new insights into how different environmental conditions affect their navigation.
Experts in animal behavior are intrigued by these results. Albert Kao, a behavioral ecologist, remarked, “I wouldn’t have guessed it, but it makes sense when explained.” Clivia Lisowski, a co-author of the study, noted that the immune cells work alongside nerve fibers in the liver. This setup could help send the magnetic signals to the pigeons’ brains.
This research opens doors to new questions. Could other animals, like mice, also navigate using similar magnetic cues? While the findings are promising, more research is necessary to confirm how pigeons use their magnetic sense and how these signals reach their brains. The immune cells are found in other areas too, like the beak and spleen, suggesting that navigation might involve multiple systems.
In a related commentary, veterinary pathologist Simon Spiro and biologist Hal Drakesmith highlighted that there might not be just one method pigeons use to find their way. They suggested that different techniques might be used for various situations, such as long-distance travel or honing in on a specific location. “It could be wise for them to have multiple navigation strategies,” they noted.
As we learn more about these remarkable birds, it becomes clear that the journey to understanding their navigational skills is just beginning.
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