It’s a(n):

Outback of Aussies
Shrewdness of Apes
Congress of Baboons
Convulsion of Belly Dancers
Bellowing of Bullfinches
Clowder of Cats
Gulp of Cormorants
Quicksand of Credit Cards
Rash of Dermatologists
Mob of Emu
Hoard of Gerbils
Implausibility of Gnu
Skein of Geese
Wealth of Information
Husk of Jackrabbit
Neverthriving of Jugglers
Puddling of Mallards
Set of Mathematicians
Buffoonery of Orangutans
Pandamonium of Parrots
Rhumba of Rattlesnakes
Harem of Seals
Hurtle of Sheep
Blessing of Unicorns