From the black shadows of the forest had emerged another shadow, so grotesque and misshapen that it seemed a figment of indigestion and weird dreams--a thing from whose shaggy body protruded what appeared to be only a long tubular snout where a head should be, and which looked to be overbalanced at the other end by a great mass of hair. It stood stone still, and for the moment Tim could not decide which end of it was head and which was tail, or even whether it were not double-tailed and headless. Then, slowly, the apparition moved. Into that hard-packed earth it dug huge hooked claws, and from its tapering muzzle a wormlike tongue licked about, gathering the outrushing white ants into its gullet. For minutes Tim lay blinking at it, wondering if he really saw it. Then, picking up his rifle, he slipped outside his net and advanced on the creature. The animal turned, sat back on its great tail, lifted its terrible claws, and waited. Six feet away, just out of its reach, Tim stopped and stared anew. Then he grinned. "You win, feller," he informed the beast. "What ye are I dunno, but any critter that's got the guts to ramble right into camp and offer to gimme a battle is too good a sport for me to shoot. Help yourself to all the ants in the world, for all o' me. I'm goin' back to bed. Bon sewer, monseer." Wherewith, still grinning, but warily watching, he backed until sure the big invader would not spring at him. Knowing nothing of ant bears, he did not know it was hardly a springing animal. Its claws looked sufficiently formidable to disembowel a man--as, indeed, they were, if the man came near enough. But when Tim had withdrawn and the sluggish brute had decided that it would not need to defend itself, it sank to all-fours and passed stiffly away into the shades whence it had come. On another night, when Tim slept, Knowlton detected a creeping, slithering sound which made him slip off the safety catch of his heavy-bulleted pistol and peer at the hut where slept the crew. No man was moving there. Still the sound persisted. Lifting his net, he spied beyond the hut of the Peruvians a moving mass on the ground--a cylindrical bulk which looked to be two feet thick, and which glided past like a solid stream of dark water flowing along above the dirt. Its beginning and end were hidden in the bush, and not until it tapered into nothing and was gone did he realize fully that he had been gazing at an enormous anaconda. Then he kicked himself for not shooting it. But before long he congratulated himself for letting it go.