Pigeons, often underestimated for their navigation skills, have been found to possess a unique biological compass located in their liver. A study published in the journal Science by researchers from the Max Planck Institute of Animal Behavior and the University of Bonn reveals that specialized immune cells known as macrophages, which accumulate iron, play a crucial role in how pigeons navigate using the Earth's magnetic field. In experiments, trained homing pigeons were released from a distance of over 20 kilometers, with those lacking these liver cells struggling to find their way home on cloudy days, while normal pigeons successfully returned. This discovery suggests that these liver cells may act as a backup navigation system when visual cues are unavailable. Furthermore, the proximity of these cells to nerve fibers hints at a potential communication pathway to the brain. This finding opens new avenues for understanding navigation in various animals, emphasizing the complexity of biological navigation systems.