Pigeons have magnets

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Science  07 Sep 1979:
Vol. 205, Issue 4410, pp. 1027-1029
DOI: 10.1126/science.472725


Research on pigeon homing suggests that magnetic field information is used for orientation. The ability of pigeons to sense magnetic fields may be associated with a small, unilateral structure between the brain and the skull which contains magnetic in what appears to be single domains.