Manta rays dive to extreme depths to build mental maps of vast oceans
Oceanic manta rays may dive more than a kilometre deep – far deeper than we thought – for navigation and orientation after leaving coastal waters, according to Australian, NZ, and international researchers. The scientists tagged and tracked 24 mantas across the globe, including in NZ's Hauraki Gulf, finding they can dive to extreme depths over 1,200 meters, which may allow them to gather information about their new surroundings after moving away from the coasts. These deep dives could enable the animals to sample the environment, including changes in the Earth's magnetic field, oxygen, temperature, and even light levels, allowing them to build mental maps that aid navigation in the open ocean, the researchers say.
https://www.scimex.org/newsfee....d/manta-rays-dive-to
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