Ken was as pleased as Hal, but he replied, soberly: “Well, kid, I hope I can hold as straight as that when we run up against a jaguar.” “Do you think we’ll see one?” asked Hal. “Just you wait!” exclaimed George, replying for Ken. “Pepe says we’ll have to sleep in the boat, and anchor the boat in the middle of the river.” “What for?” “To keep those big yellow tigers from eating us up.” “How nice!” replied Hal, with a rather forced laugh. So, talking and laughing, the boys resumed their down-stream journey. Ken, who was always watching with sharp eyes, saw buzzards appear, as if by magic. Before the boat was half a mile down the river buzzards were circling over the remains of the deer. These birds of prey did not fly from the jungle on either side of the stream. They sailed, dropped down from the clear blue sky where they had been invisible. How wonderful that was to Ken! Nature had endowed these vulture-like birds with wonderful scent or instinct or sight, or all combined. But Ken believed that it was power of sight which brought the buzzards so quickly to the scene of the killing. He watched them circling, sweeping down till a curve in the river hid them from view. And with this bend came a welcome change. The bluff played out in a rocky slope below which the green jungle was relief to aching eyes. As the boys made this point, the evening breeze began to blow. They beached the boat and unloaded to make camp. “We haven’t had any work to-day, but we’re all tired just the same,” observed Ken. “The heat makes a fellow tired,” said George. They were fortunate in finding a grassy plot where there appeared to be but few ticks and other creeping things. That evening it was a little surprise to Ken to realize how sensitive he had begun to feel about these jungle vermin. Pepe went up the bank for fire-wood. Ken heard him slashing away with his _machete_. Then this sound ceased, and Pepe yelled in fright. Ken and George caught up guns as they bounded into the thicket; Hal started to follow, likewise armed. Ken led the way through a thorny brake to come suddenly upon Pepe. At the same instant Ken caught a glimpse of gray, black-striped forms slipping away in the jungle. Pepe shouted out something. “Tiger-cats!” exclaimed George.