An exaltation of larks

We do like to categorize. Ever since Adam, and there’s no turning back. I’ve been wondering what the correct way to refer to a group of bears would be, because I tend to wonder about things like this, and I was greatly amused by the results of my search.

A sloth of bears
A gam of whales
A shrewdness of apes
A warren of rabbits
A drift of hogs

Are we saying that the congregating of bears is a mortal sin?