The great shadow descended like a falling cloud. And behold! it was a winged creature: if bird, then greater than all other birds, and it was naked, and neither quill nor feather did it bear, and its vast pinions were as webs of hide between horned fingers; and it stank. A creature of an older world maybe it was, whose kind, lingering in forgotten mountains cold beneath the Moon, outstayed their day, and in hideous eyrie bred this last untimely brood, apt to evil. And the Dark Lord took it, and nursed it with fell meats, until it grew beyond the measure of all other things that fly; and he gave it to his servant to be his steed. Down, down it came, and then, folding its fingered webs, it gave a croaking cry, and settled upon the body of Snowmane, digging in its claws, stooping its long naked neck. (LotR V.6)

Creeping to his side, we looked over the rocks. The place into which we gazed was a pit, and may, in the early days, have been one of the smaller volcanic blow-holes of the plateau. It was bowl-shaped and at the bottom, some hundreds of yards from where we lay, were pools of green-scummed, stagnant water, fringed with bullrushes. It was a weird place in itself, but its occupants made it seem like a scene from the Seven Circles of Dante. The place was a rookery of pterodactyls. There were hundreds of them congregated within view. All the bottom area round the water-edge was alive with their young ones, and with hideous mothers brooding upon their leathery, yellowish eggs. From this crawling flapping mass of obscene reptilian life came the shocking clamor which filled the air and the mephitic, horrible, musty odor which turned us sick. But above, perched each upon its own stone, tall, gray, and withered, more like dead and dried specimens than actual living creatures, sat the horrible males, absolutely motionless save for the rolling of their red eyes or an occasional snap of their rat-trap beaks as a dragon-fly went past them. Their huge, membranous wings were closed by folding their fore-arms, so that they sat like gigantic old women, wrapped in hideous web-colored shawls, and with their ferocious heads protruding above them. Large and small, not less than a thousand of these filthy creatures lay in the hollow before us.

Our professors would gladly have stayed there all day, so entranced were they by this opportunity of studying the life of a prehistoric age. ...

Finally, however, Challenger, bent upon proving some point which Summerlee had contested, thrust his head over the rock and nearly brought destruction upon us all. In an instant the nearest male gave a shrill, whistling cry, and flapped its twenty-foot span of leathery wings as it soared up into the air. The females and young ones huddled together beside the water, while the whole circle of sentinels rose one after the other and sailed off into the sky. It was a wonderful sight to see at least a hundred creatures of such enormous size and hideous appearance all swooping like swallows with swift, shearing wing-strokes above us; but soon we realized that it was not one on which we could afford to linger. At first the great brutes flew round in a huge ring, as if to make sure what the exact extent of the danger might be. Then, the flight grew lower and the circle narrower, until they were whizzing round and round us, the dry, rustling flap of their huge slate-colored wings filling the air with a volume of sound that made me think of Hendon aerodrome upon a race day.

"Make for the wood and keep together," cried Lord John, clubbing his rifle. "The brutes mean mischief."

The moment we attempted to retreat the circle closed in upon us, until the tips of the wings of those nearest to us nearly touched our faces. We beat at them with the stocks of our guns, but there was nothing solid or vulnerable to strike. Then suddenly out of the whizzing, slate-colored circle a long neck shot out, and a fierce beak made a thrust at us. Another and another followed. Summerlee gave a cry and put his hand to his face, from which the blood was streaming. I felt a prod at the back of my neck, and turned dizzy with the shock. Challenger fell, and as I stooped to pick him up I was again struck from behind and dropped on the top of him. At the same instant I heard the crash of Lord John's elephant-gun, and, looking up, saw one of the creatures with a broken wing struggling upon the ground, spitting and gurgling at us with a wide-opened beak and blood-shot, goggled eyes, like some devil in a medieval picture. Its comrades had flown higher at the sudden sound, and were circling above our heads.

"Now," cried Lord John, "now for our lives!"

We staggered through the brushwood, and even as we reached the trees the harpies were on us again. Summerlee was knocked down, but we tore him up and rushed among the trunks. Once there we were safe, for those huge wings had no space for their sweep beneath the branches. As we limped homewards, sadly mauled and discomfited, we saw them for a long time flying at a great height against the deep blue sky above our heads, soaring round and round, no bigger than wood-pigeons, with their eyes no doubt still following our progress. At last, however, as we reached the thicker woods they gave up the chase, and we saw them no more.

"A most interesting and convincing experience," said Challenger, as we halted beside the brook and he bathed a swollen knee. "We are exceptionally well informed, Summerlee, as to the habits of the enraged pterodactyl."

Summerlee was wiping the blood from a cut in his forehead, while I was tying up a nasty stab in the muscle of the neck. Lord John had the shoulder of his coat torn away, but the creature's teeth had only grazed the flesh.

"It is worth noting," Challenger continued, "that our young friend has received an undoubted stab, while Lord John's coat could only have been torn by a bite. In my own case, I was beaten about the head by their wings, so we have had a remarkable exhibition of their various methods of offence."

"It has been touch and go for our lives," said Lord John, gravely, "and I could not think of a more rotten sort of death than to be outed by such filthy vermin. I was sorry to fire my rifle, but, by Jove! there was no great choice."

"We should not be here if you hadn't," said I, with conviction.

"It may do no harm," said he. "Among these woods there must be many loud cracks from splitting or falling trees which would be just like the sound of a gun. But now, if you are of my opinion, we have had thrills enough for one day, and had best get back to the surgical box at the camp for some carbolic. Who knows what venom these beasts may have in their hideous jaws?" -- Doyle, A. C. (1912) The Lost World, copied from Project Gutenberg html text; bolds by squire.