Limits to Induction-Based Magnetoreception

While behavioral experiments apparently have established that several species perceive magnetic fields as small as, or perhaps even substantially smaller than, the geomagnetic field of the earth, in few species is an organ responsible for magnetoreception clearly identified. Magnetite crystallites in bacteria and the ampullae of Lorenzini of the elasmobranch fish seem the only clear cases. Magnetoreception may also be the only perceptual sense found in animals for which a similar sense is not manifest in humans.