Hi all,
Yes, very interesting!
This is the second time I read about this topic, obviously not only the Blacktips in Moorea, but also Lemon sharks at Bimini show this social interacting. This is documented in an article of the Reef Quest Centre for Shark Research:
Estuaries: Lemon Shark
I assume, there is a lot more for us to learn


about those fascinating predators.
Geli