How Migratory Birds Use Their Eyes to Navigate
Author Information
Author(s): Heyers Dominik, Manns Martina, Luksch Harald, Güntürkün Onur, Mouritsen Henrik
Primary Institution: University of Oldenburg, Germany
Hypothesis
Migratory birds use their visual system to perceive the reference compass direction of the geomagnetic field.
Conclusion
The study demonstrates a functional neuronal connection between the retinal neurons and Cluster N in migratory birds, suggesting that they perceive the magnetic field as a visual pattern.
Supporting Evidence
- Retinal cryptochrome-expressing neurons show high activity during magnetic compass orientation.
- Cluster N is the only known forebrain area active during magnetic compass orientation.
- Neuronal tracing revealed colocalization of retinal projections and Cluster N connections.
Takeaway
Birds can see the Earth's magnetic field using their eyes, which helps them find their way during migration.
Methodology
The study combined neuronal tracing with behavioral experiments and sensory-driven gene expression analysis.
Participant Demographics
Adult garden warblers (Sylvia borin) were used in the study.
Digital Object Identifier (DOI)
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