The following website contains a list of the terms for various groups of animals. I remember being particularly amused by "a rabble of butterflies" ...
But then again, a sleuth of bears presents wonderful possibilities for a bizarre talking animal/mystery story ... or how about an implausibility of gnus? ... or a business of ferrets. I wonder what the business of ferrets is?
Note, too, that the herd plural of boar is "singular" - guess they really are antisocial.
Language is a crazy, split-personality, wonderful thing.