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We analyzed ERG-responses of the marsh frogs retina under two directions of MF, natural for spring migration in this population and inverse MF. Flashes of blue and red light were tested in this study. We found small but statistically significant difference between a-wave amplitudes in ERG-responses to blue but not red light. b-wave amplitudes did not show dependence on MF direction. Interestingly, we observed similar effect of MF on ERG-photo responses under blue but not under red light in migratory bird, European robin. Preliminarily, our data could be suggestive of magnetic compass in frogs could be photosensitive and be localized in the retina.