A new study says homing pigeon livers act like compasses. Other experts aren’t so sure

A new study says homing pigeon livers act like compasses. Other experts aren’t so sure

A Science study (Max Planck) finds iron macrophages in pigeon livers may act as compasses; depleting them disoriented birds on cloudy days. Multiple experts dispute it: the iron barely responds to Earth's weak field and no brain signal pathway is demonstrated.