On the basis of their reaction to my second intrusion, I judged that their thoughts had run somewhat like this: A: The thing that flew over us was no bird, since no bird would have to work so hard to stay in the air — and, anyway, we know all the birds. B: If it was no bird, it was very likely just another trick of those two-legged dwarfs against whom there ought to be a law. C: The two-legged dwarfs (both black and white) have, as long as our long memories go back, killed our bulls for their tusks.