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flag Manta rays dive deep every few days to navigate open oceans using Earth’s magnetic field, new study finds.

flag Oceanic manta rays, the largest ray species, make extreme deep dives—down to 1,250 meters—during migrations across open oceans, according to new research. flag Tagged rays in Indonesia, Peru, and New Zealand showed these dives, occurring every two to three days, likely help them navigate using Earth’s magnetic field. flag The dives, which involve rapid descents and brief pauses in cold, oxygen-rich layers, precede high-speed, directional travel of up to 200 km per day. flag Scientists ruled out feeding, predator avoidance, and temperature regulation as reasons, suggesting the behavior aids in creating a mental map of featureless ocean expanses. flag The findings, published in Frontiers in Marine Science, highlight the need for international conservation of both coastal and offshore habitats.

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