Only a large animal or a man could have done this.

He looked closely to see whether there were any scratches indicative of the passage of deer-hoofs or bear-claws, but there were none except those that appeared so large as to show plainly from a distance.

There was every likelihood, therefore, that some human being had but very lately moved the stones, and not only since the rain of last night but since the surface had had time to dry again; that is, in the course of the afternoon.
He moved his body forward where he could examine the soil alongside the ledge.

The grass was nowhere bent and broken, still that was no sufficient indication.

There at last was a plain human track, the impression of a naked foot with its toe-marks to the north, and the impression was fresh! But the Tehua walked on round sandals.