Scientists studying satellite images from all over the world were gobsmacked to note that, in the vast majority of instances, grazing or resting cattle line up their bodies so that they are facing either magnetic north or south. The exception to this rule occurs on pastures beneath or near high-voltage power lines which disrupt the normal electromagnetic fields of the earth.
Click here for an abstract of the study as reported in the Proceedings of the National Academy of Sciences (which also contains a PDF of the full report).
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