They ceased then to take much notice of their fresh follower all through that day and the next; and the Indian trudged on beside the luggage mules, with his shoulders up and his head bent, as if he were carefully watching where he should next place his feet, speaking to nobody but Diego, when the guide left the leading mule for a few minutes to stop and look right along the line, inspecting the loads as the mules passed him, smiling at the colonel and Perry, and exchanging rather a fierce look with John Manning; for, somehow, these two did not seem to be the best of friends. Then he would let his companion who guarded the rear come right up, walk beside him, talking for a few minutes, and then start forward again at a trot, passing them once more till he had reached the leading mule.
There was little change that day, always a constant succession of precipitous walls to right and left, their way being along a narrow shelf, with the stream they followed thundering beneath them, sometimes a hundred feet beneath, at others perhaps a thousand, and quite invisible, but making itself evident by the echoing roar of the rushing waters.
They passed nobody, neither did they see a single animal to tempt them to use rifle or gun that hung by its sling across their backs, till late in the afternoon, when, just as they turned the corner of a great buttress of rock, a huge bird suddenly swept by, gazing wonderingly at them. By one consent, father and son paused to watch the ease with which the great-winged creature glided along the gorge, half-way between the top and the stream below, turned suddenly and came back, as if to renew their acquaintance, and then curved round again, sweeping along for a short distance, and again wheeling round, not in a series of circles, but ellipses, each turn sending it almost without effort higher and higher, till it had reached a sufficient elevation, when it passed out of sight over the wall on their left.
“Eagle?” said Perry.
“Vulture,” replied the colonel. “There you have seen one of the biggest birds that fly. Didn’t you notice its naked head?”
“Yes; and it had quite a comb over the top, and a ruff round its neck. I thought it was an eagle from its great hooked beak.”
“The featherless head is a general mark of the vultures,” said the colonel. “I wish I had had a shot at it; but I don’t know: I don’t want to be burdened with bird-skins, especially of such a size as that.”
“What a monster to skin!” said Perry thoughtfully. “Why, its wings must have been six or seven feet from point to point.”
“Double the length—say fourteen or fifteen, my boy,” replied the colonel. “It must have been that. Old travellers used to make them out to be twenty-five or thirty feet from wing-tip to wing-tip; but they do reach the size I say. Hallo! what are we stopping for?”
“Why, there’s a bridge,” cried Perry; “and the path goes along on the other side of the gorge.”