Interesting paper but unsure about the conclusion. Depleting macrophages and the birds unable to home, but how do they know this is specifically due to the loss of the magnetically sensitive iron versus the loss of macrophages-nerve cell interaction in general?
www.science.org/doi/10.1126/...
Birds use a variety of navigational strategies, including the geomagnetic field, especially when other cues are not available, such as under overcast or nocturnal conditions. Magnetite particles in th...
