...when they come in a "flock"?
By "we", I mean "people". I don't herd sheep, and I'm guessing you don't either, or you wouldn't be sitting there reading this nonsense.
But I saw a man doing it today. Or at least, I saw a man and two dogs chasing after some sheep in a field, and I assumed he was herding them. The sheep, not the dogs.
Oh stop it, you're confusing me now.