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A macrophage compass for pigeons
Xiaoting Wu1, Jacques Behmoaras1
1Centre for Biomedical Data Science, Duke-NUS Medical School, Singapore, Singapore.
Trends in Immunology
|July 30, 2026
Summary
Homing pigeons use Earth's magnetic field for navigation. Superparamagnetic hepatic macrophages in their liver are identified as key receptors, detecting magnetic information crucial for flight.
Area of Science:
- Animal behavior
- Biophysics
- Neuroethology
Background:
- Homing pigeons navigate using Earth's magnetic field.
- The biological mechanism of magnetoreception is not fully understood.
Purpose of the Study:
- To investigate the role of hepatic macrophages in pigeon magnetoreception.
- To identify the cellular components responsible for detecting magnetic fields.
Main Methods:
- Analysis of hepatic macrophages from homing pigeons.
- Assessment of superparamagnetic properties of these cells.
- Correlation of macrophage presence with navigational ability.
Main Results:
- Superparamagnetic hepatic macrophages were identified in homing pigeons.
- These macrophages possess properties suitable for detecting magnetic fields.
- Evidence suggests these cells transmit geomagnetic information.
Conclusions:
- Hepatic macrophages are likely magnetoreceptors in homing pigeons.
- These cells play a critical role in supporting avian navigation.
- Further research is needed to elucidate the complete pathway of magnetoreception.
