Sharks Form Friendships, Study Finds

New research from Fiji indicates that bull sharks possess complex social lives, challenging the long-held stereotype of these marine predators as solitary creatures.

A six-year observational study involving 184 bull sharks at the Shark Reef Marine Reserve revealed that their movements are not random. Instead, the sharks form consistent relationships with specific individuals, exhibiting behaviors like swimming in parallel or tracking one another.

These findings suggest that bull sharks actively choose companions and avoid others, mirroring human social dynamics. The study, published in Animal Behaviour, observed deliberate interactions, including lead-follow movements, indicating a sophisticated social structure.

Researchers noted that reproductive-aged adult sharks formed the core of this social network. Size also played a role, with both sexes preferring to interact with females. Male bull sharks, who are typically smaller than females, appeared to have more social connections, possibly as a strategy to avoid aggressive encounters with larger individuals.

This research, led by Natasha Marosi of the Fiji Shark Lab and involving Professor Darren Croft from the University of Exeter, marks a significant step in understanding shark social behavior. It suggests that many shark species have richer social lives than previously understood.