Carcharhinus amblyrhynchos. The gray reef is common and curious, but sometimes gets agitated in the presence of divers. Down around Kwaj where diving activity is heavy, the gray reefs have either become so accustomed to divers that they don’t bother to come around or might have even moved away up the reef. Encountering divers so often might be upsetting enough that the sharks decide to move on to less crowded reefs. It is certainly the case that when we dive on isolated midlagoon pinnacles or reefs we often see many more gray reefs, and they are frequently curious.