When Super-Apes Plot by Wilder Anthony — Read

CLUTCHING his rifle, Hardin went to the mouth of the cave and peered through the vines. He must have slept longer than he thought, for he found that the shadows were already lengthening--in another hour or so it would be dark. At first he saw nothing of the ape-men, but at last he made them out in the bushes at the opposite edge of the clearing.

There must have been fifty of them, and they were gathered in a half circle around their chief, who was talking earnestly. In the dim light they looked more like apes than men, with their squat figures and long arms; had it not been for the weapons they carried one might have sworn that he witnessed a council of gorillas.