The water at this point was almost fresh, because the estuary, though fully two miles wide, was filled with the tide of the great river rolling slowly down from the heart of the continent. The further shore was so flat that nothing could be seen of it but an endless, pale green forest of giant reeds. But the nearer shore was skirted, at a distance of perhaps half a mile from the water, by a rampart of abrupt, bright, rust-red cliffs. The flat land between the waterside and the cliffs, except for the wide strip of beach, was clothed with an enormous and riotous growth of calamaries, tree-ferns, cane and palm, which rocked and crashed in places as if some colossal wayfarers were pushing through them. Here and there along the edge of the cliffs sat tall beings with prodigious, saw-toothed beaks, like some species of bird conceived in a nightmare. Far out across the water one of these creatures was flapping slowly in from the sea. Its wings--eighteen feet across from tip to tip--were not the wings of a bird, but of a bat or a hobgoblin. It had dreadful, hand-like claws on its wing-elbows; and its feet were those of a lizard. As this startling shape came flapping shoreward, the head afloat upon the water eyed it with interest, but not, as it seemed, with any great apprehension. Yet it certainly looked formidable enough to excite misgivings in most creatures. Its flight was not the steady, even winging of a bird, but spasmodic and violent. It came on at a height of perhaps twenty feet above the sluggish tide, and its immense, circular eyes appeared to take no notice of the strange head that watched it from the water's surface. It seemed about to pass a little to one side, when suddenly, with a hoarse, hooting cry, it swerved and swooped, and struck at the floating head with open jaws. Swift as was that unexpected attack, the assailant struck nothing but a spot of foam where the head had disappeared. Simultaneously with the lightning disappearance, there was a sudden boiling of the water some eighty-odd feet away. But the great bird-lizard was either too furious to notice this phenomenon or not sagacious enough to interpret it. Flopping into the air again, and gnashing his beak-like jaws with rage, he kept circling about the spot in heavy zigzags, expecting the harmless looking head to reappear. All at once his expectations were more than realized. The head not only reappeared, but on a towering leather-colored column of a neck it shot straight into the air to a height of twenty feet. The big, placid eyes were now sparkling with anger. The flat, shovel jaws were gaping open. They seized the swooping foe by the root of the tail, and, in spite of screeches and wild flappings, plucked him down backwards. At the surface of the water there was a convulsive struggle, and the wide wings were drawn clean under.