Sharks Demonstrate Complex Social Behaviors, Study Finds
By Eleanor Mann, Junior News Reporter
Published: 01:24 GMT, 18 March 2026 | Updated: 01:33 GMT, 18 March 2026
New research has challenged the prevailing perception of sharks as solitary creatures, revealing that bull sharks exhibit complex social behaviors akin to friendships. Conducted at the Shark Reef Marine Reserve in Fiji, the study highlights that these marine predators form consistent relationships with individual sharks rather than swimming randomly.
The research, which spans six years and involved the observation of 184 bull sharks, was published in the scientific journal Animal Behaviour. It scrutinizes the social dynamics of one of the ocean’s most adaptable species, known for their formidable presence, reaching lengths of up to 3.5 meters and weights of approximately 230 kilograms. Interestingly, bull sharks are unique in their ability to thrive in both salt and fresh water, making them common in rivers and estuaries.
Although often placed among the top three shark species responsible for unprovoked human bites—alongside great whites and tiger sharks—such incidents remain exceedingly rare. The new findings suggest that these sharks possess a social structure previously underestimated.
Two specific interactions were examined in the study: proximity maintenances—where sharks remain within one body length of each other—and intentional behaviors, including parallel swimming and ‘lead-follow’ patterns, where one shark seemed to guide another.
Results indicated that bull sharks frequently teamed up, swimming closely or tracking one another through the water. The study also noted a clear preference for certain companions, with sharks avoiding other individuals altogether.
Natasha Marosi, lead author of the study and founder of the Fiji Shark Lab, stated, “Just as humans maintain a spectrum of social relationships—from casual acquaintances to close friends—and actively avoid certain individuals, these bull sharks appear to engage in similar social behaviors.”
The social connections among adult sharks, especially those of reproductive age, formed the backbone of their interactions, suggesting strategic motivations behind these bonds. Interestingly, both sexes displayed distinct behaviors, with males often seeking out female companions, while males generally maintained more social connections. This increased sociability among smaller male bull sharks may serve as a protective measure against aggression from larger individuals.
Professor Darren Croft of the University of Exeter’s Centre for Research in Animal Behavior commented on the implications of the study. He noted that the findings offer a significant shift in understanding shark behavior: “Contrary to commonly held perceptions of sharks, our study shows they have relatively rich and complex social lives. We are only just beginning to explore the social structures of various shark species.”
This groundbreaking research adds depth to our understanding of shark behavior and may reshape public perception of these often-misunderstood creatures.
Source: Original Source
