Loggerhead turtles sense latitude by the planet's magnetic field intensity, and new research finds they're good at determining their longitude too, probably via the field's inclination.

红海龟可以通过地球磁场强度来辨识纬度。新的研究发现，借助地球磁场方向，它们在辨识自己所在的经度上也很在行。

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At this time of year in the gulf, loggerhead turtles are migrating, terns are breeding and tuna are spawning.

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Meanwhile, Andrew Read, a marine biologist at Duke University in North Carolina, is following 45 tagged loggerhead turtles.

ECONOMIST: Oceanography