I read the term but am failing at the spelling. Just like you have a gaggle of geese or other words. The word I'm looking for is to describe a crowd of various nationalities, skin colour etc who are constantly talking, just like penguins do. The opposite of homogeneous is heterogeneous, but is known/used in the animal kingdom more. Does anybody know the word I'm looking for. I'm sorry I can't be more clear than that atm.
Update - It rhymes with concupy - concopious , it is something similar, it is also used to describe in many small children fantasy books when birds and other animals make noise in celebration, all in different voices.