I decided to ask my friends, colleagues, and the internet, and got some very strange answers.
There's a whole lot more to the animal kingdom than just some herds and packs. In fact, so much that we have even more strange names for groups of animals. A "scurry of squirrels"? I mean, come on.
That's no herd, it's a murder. And all this time I'd just been using herd, flock and school. My eyes, they have been opened.