A Squadron of Oysters Catchers?

What is the collective name for a group of Oyster Catchers?  

Is there such a thing?

Confident, cocky little creatures.  Stocky and robotic looking.
Never in a hurry to fly away,almost daring you to come closer
whilst all the time watching you with one, orange, beady eye!

 But when they do take flight its so effortless and so elegant;  

the RAF of the bird world.

 They are my favourite.  Can you tell!