Homing pigeons may navigate using iron-rich immune cells in their livers that function as magnetic sensors [1, 2, 3].
This finding challenges previous assumptions about how birds perceive the Earth's magnetic field. If confirmed, it shifts the understanding of biological navigation from the head or eyes to internal organs.
The study released this month suggests that these specialized cells in the liver allow pigeons to detect magnetic signatures [3, 5, 6]. Researchers said these cells help the birds maintain a sense of direction during long-distance travel [1, 2].
For decades, scientists have sought to explain the precise mechanism behind avian magnetoreception. While some theories pointed toward the beak or the eyes, this research highlights the role of the liver's immune cells [1, 4]. These cells contain iron, which is essential for the sensors to interact with the planet's magnetic field [1, 3].
The research indicates that these magnetic sensors provide a biological compass that guides pigeons back to their homes [2, 6]. By utilizing the liver as a sensory hub, pigeons can navigate across vast distances with high precision [1, 2].
Scientists are now looking further into how the signals from the liver are transmitted to the bird's brain to influence flight paths [3, 4]. The discovery opens new avenues for studying other migratory species that may share similar internal magnetic sensors [1, 2].
“Pigeons may navigate using iron-rich immune cells in their livers.”
This research suggests a paradigm shift in avian biology by identifying a non-cephalic source for magnetic sensing. By locating the 'compass' in the liver rather than the brain or eyes, the study implies that complex navigation involves a distributed sensory system, potentially altering how scientists approach the study of migration across all bird species.
