Indeed- There is one that snatches others from above, and it seems to come in at least two different... colors? Green and black.

[Most of them seemed to live close in harmony, but there were others that certainly did go after whatever came close.]

There are a few in this area, and seem to go for the smaller pieces that can break from the one you followed here. Likely a reason that one moves so closely together to make a larger creature.

[Just one example, of course.]