Magnetic material carrying natural remanent magnetization is present in the head of the common Pacific dolphin (Delphinus delphis). A sample of this material, isolated from the dura mater, has a moment of 2 × 10 -5 gauss-cubic centimeter. The presence of such strongly magnetized material suggests that it may play a navigational role.
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Zoeger et al. (1981) studied this question.
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