The flight at last carried them across a frightful gorge and a short distance beyond the pteranodon circled a lofty granite peak, toward the summit of which it slowly dropped, and there, below him, Tarzan of the Apes saw a nest of small thipdars, eagerly awaiting with wide distended jaws the flesh that their savage parent was bringing to them.
The nest rested upon the summit of a lofty granite spire, the entire area of the summit encompassing but a few square yards, the walls dropping perpendicularly hundreds of feet to the rough granite of the lofty peak the spire surmounted. It was, indeed, a precarious place at which to stage a battle for life. Cautiously, Tarzan of the Apes drew his keen hunting knife from its sheath. Slowly his left hand crept upward against his body and passed over his left shoulder until his fingers touched the thipdar's leg. Cautiously, his fingers encircled the scaly, bird-like ankle just above the claws.
The reptile was descending slowly toward its nest. The hideous demons below were screeching and hissing in anticipation. Tarzan's feet were almost in their jaws when he struck suddenly upward with his blade at the breast of the thipdar.
It was no random thrust. What slender chance for life the ape-man had depended upon the accuracy and the strength of that single blow. The giant pteranodon emitted a shrill scream, stiffened convulsively in mid-air and, as it collapsed, relaxed its hold upon its prey, dropping the ape-man into the nest among the gaping jaws of its frightful brood.
Fortunately for Tarzan there were but three of them and they were still very young, though their teeth were sharp and their jaws strong.
Striking quickly to right and left with his blade he scrambled from the nest with only a few minor cuts and scratches upon his legs.
Lying partially over the edge of the spire was the body of the dead thipdar. Tarzan gave it a final shove and watched it as it fell three hundred feet to the rocks below. Then he turned his attention to a survey of his surroundings, but almost hopelessly since the view that he had obtained of the spire while the thipdar was circling it assured him that there was little or no likelihood that he could find any means of descent.
The young thipdars were screaming and hissing, but they had made no move to leave their nest as Tarzan started a close investigation of the granite spire upon the lofty summit of which it seemed likely that he would terminate his adventurous career.
Lying flat upon his belly he looked over the edge, and thus moving slowly around the periphery of the lofty aerie he examined the walls of the spire with minute attention to every detail.
Again and again he crept around the edge until he had catalogued within his memory every projection and crevice and possible handhold that he could see from above.