"Are those monstrous things birds?" I demanded. "Let me look. What long and bony legs they have! They would stride over us without touching our heads; but how they could kick!" "And how they could run!" put in the doctor. "See, they stride easily over seven or eight feet with a single step. They must be messenger birds, for there are only four of them, and their riders are not armed." "They may have hundreds more of them in reserve, and they could fight far more viciously than the men. See what a wicked beak and what a long muscular neck they have. They could crush a skull in a twinkling with one swift swoop of that head! I will fight the men, but I will take no chances with those birds!" Although these strange, small-winged creatures had started long after the soldiers, they had quickly passed them, and were now beginning to mount toward our plateau. They were making swift detours at intervals, as if to reconnoitre. We were hidden behind our rocks and shields, and the riders could not see us, and they had evidently not yet seen the brass barrel of our telescope. It would be folly for them to attempt to come up the road we were guarding, for we could easily heave boulders over and crush them. I had already put my shoulder to an immense rock near the brink, to see if it was as heavy as it looked. I found it porous and crumbly, and no heavier than so much chalk. Up the roadway the great birds climbed with wonderful ease. Their riders were evidently looking for us without any idea where we were. "I won't see those elephantine bipeds come any nearer to me!" I exclaimed, and rushing to the boulder, which was certainly four feet in diameter, I toppled it over the brink, and expected to see it carry everything down before it. It rolled slowly down the steep bank, with hardly a third the force and speed of the same mass on Earth. This discouraged me, but I watched for it to reach the foremost bird. He was surprised by it, but made one step sideways, and, lifting his great right leg, the stone rolled under him without any damage. He gave a queer, guttural croak, accompanied by a most violent motion of the head and neck. The other birds, thus warned, dodged quickly sidewise, and avoided the slowly rolling boulder; but all three of the riders were thrown by the swift lateral movement of the birds. The astonished men picked themselves up slowly from the bushes and approached their birds. But they could scarcely reach with their hands the lower part of the neck where they had sat. "Unless they are good jumpers, they cannot mount again without a ladder!" said the doctor. "Jumping is easier than standing still here," I interrupted. "I can jump ten feet high with no trouble." "Yes; but these Martian boobies haven't your muscles. _Aber Blitzen!_ did you see that fellow mount his bird again?"