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Several experiments over the years have shown that the Earth's magnetic fieldis essential for orientation in birds migration. The most promising explanationfor this orientation is the photo-stimulated radical pair (RP) mechanism. Inorder to define a reference frame for the orientation task radicals must havean intrinsic anisotropy. We show that this kind of anisotropy, and consequentlythe entanglement in the model, are not necessary for the proper functioning ofthe compass. Classically correlated initial conditions for the RP, subjected toa fast decoherence process, are able to provide the anisotropy required. Even adephasing environment can provide the necessary frame for the compass to work,and also implies fast decay of any quantum correlation in the system withoutdamaging the orientation ability. This fact significantly expands the range ofapplicability of the RP mechanism providing more elements for experimentalsearch.

Environment-induced anisotropy and the sensitivity of the radical pair mechanism in the avian compass