"Now the thing was emerging from the cell and was again advancing up the corridor, its misshapen head close to the ground. It paid no more heed to the locked doors. It was smelling out his trail. He saw it more plainly now; the gray light limned a giant anthropomorphic body, but vaster of bulk and girth than any man. It went on two legs, though it stooped forward, and it was grayish and shaggy, its thick coat shot with silver. Its head was a grisly travesty of the human, its long arms hung nearly to the ground.
Conan knew it at last—understood the meaning of those crushed and broken bones in the dungeon, and recognized the haunter of the pits. It was a gray ape, one of the grisly man-eaters from the forests that wave on the mountainous eastern shores of the Sea of Vilayet. Half mythical and altogether horrible, these apes were the goblins of Hyborian legendary, and were in reality ogres of the natural world, cannibals and murderers of the nighted forests."
Chapter 5: The Haunter of the Pits, The Hour of The Dragon, Robert E. Howard