The result that magnetic-field detection might have evolved separately for the map and compass senses bolsters growing evidence for dual magnetoreception systems in other vertebrates 1, 3.

Loggerhead turtles “dance” when exposed to food-associated magnetic fields, and their magnetic map may help them return to specific areas after long migrations.

Like monarchs, Bogong moths use the Earth’s magnetic field for their long journey. They combine the magnetic compass with visual cues or markers, though researchers did not know what these were.