(CNN)We can't quite say sharks can be friends, but new evidence is showing us that sharks form social bonds with others and can work together — to a degree.
Gray reef sharks form long-lasting social groups likely for hunting, study shows
Gray reef sharks regularly meet up together in the same groups, according to a new study published on Tuesday in the Proceedings of the Royal Society.
The results gleaned new insights into the social lives of marine predators previously believed to be largely solitary creatures. And some of those social groups remain stable for periods of up to four years.
"What is surprising is the level of social stability in these sharks. They like to associate with the same individuals," said senior author Yannis Papastamatiou, an assistant professor of biological sciences at Florida International University in Miami.
Papastamatiou and his colleagues used a hook and a line to capture 41 gray reef sharks at Palmyr