Scientists say some species of sharks are social creatures, who return day after day to a group of the same fellow sharks. Some can also learn to solve simple puzzles — just by watching other sharks solve them.
Papastamatiou's team studied gray reef sharks populating the waters off Palmyra Atoll, a sunken island ringed by coral reefs, in the central Pacific Ocean between the Hawaiian Islands and Fiji. They attached small location transmitters to 41 sharks, which allowed them to track the animals' movements around the reef.
"If we hang out together and I see something, then you can come and try and take advantage of that," he says."And alternatively, if you see something, then I can try and take advantage of that." "I mean, I don't have a lot of friends I do that with," he jokes, referring to the four years of camaraderie.
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