Tarzan of the Apes is a novel written by Edgar Rice Burroughs, the first in a series of books about the title character Tarzan. It was first published in the pulp magazine All-Story Magazine in October 1912. The character was so popular that Burroughs continued the series into the 1940s with two dozen sequels. (Wikipedia)
One afternoon, while Clayton was working upon an addition to their cabin, for he contemplated building several more rooms, a number of their grotesque little friends came shrieking and scolding through the trees from the direction of the ridge. Ever as they fled they cast fearful glances back of them, and finally they stopped near Clayton jabbering excitedly to him as though to warn him of approaching danger.
At last he saw it, the thing the little monkeys so feared—the man-brute of which the Claytons had caught occasional fleeting glimpses.
It was approaching through the jungle in a semi-erect position, now and then placing the backs of its closed fists upon the ground—a great anthropoid ape, and, as it advanced, it emitted deep guttural growls and an occasional low barking sound.
Clayton was at some distance from the cabin, having come to fell a particularly perfect tree for his building operations. Grown careless from months of continued safety, during which time he had seen no dangerous animals during the daylight hours, he had left his rifles and revolvers all within the little cabin, and now that he saw the great ape crashing through the underbrush directly toward him, and from a direction which practically cut him off from escape, he felt a vague little shiver play up and down his spine.