A group of owls is known, of course, as a parliament. I guess these owls are not sure whether two of them can constitute a group. I’d just call them “a couple.” I think you’d need at least five or six to constitute a parliament. Then again, I know less about collective nouns than I do about birds, so maybe two can make a parliament.
As a side note, I don’t plan to make a whole lot more of these “nighttime” strips, though they do take considerably less time to draw.