Photo by bertiegregory | How many sharks can you count in this photo? Comment below! A group of snorkelers investigates an even bigger group of basking sharks. Having been filter-feeding all morning, these sharks shut their mouths and began circling one another. New science suggests these aggregations aren’t just caused by big food patches: They could also be some kind of shark social event. It’s extraordinary how little we know about such a big fish. Follow bertiegregory for more wildlife adventures #britishwildlife #underwater #freediving #baskingshark #shark #finspirechange #scotland