Bobolink was an imaginative boy. He could see many things that others were apt to pass by without discovering anything out of the ordinary. It was a weakness which Bobolink had to guard against; lest he discover things that had no foundation in fact.
He sat there, listening and looking, for a long time. The music of the breeze in the tree-tops made him a little nervous at first; but presently he seemed to get more accustomed to the sounds, and then they made him drowsy, so that he had to take himself sharply to task more than once because his eyes found it so easy to shut.
Wishing to have something to think about, so as to keep his wits aroused, Bobolink began to try and figure out just where his fellow sentinels were located and imagine what they were doing. Could they be struggling, as he was, to keep awake, one of the hardest things a boy can battle with?
What was that? Surely something moved out yonder among the scrub!
Bobolink sat straight up. He was no longer sleepy. This thing seemed to have made his eyes fly wide open; and with his heart pumping at a tremendous rate, sending the hot blood bounding through his veins, surely he was now in no danger of sleeping on his post.
He watched the spot from which the sound had seemingly come. The moon penetrated the bushes only faintly, because it was now nearing the western horizon, its journey for the night almost done. Strive as Bobolink might to see whether any one was crawling along there, he could not for a time make sure.
Then he detected a movement that must mean something. And at the same time he discovered what seemed to be twin glowworms in the darkness.
Bobolink had had some little experience in such things, and had read a good deal on the subject. He knew that in the night time the eyes of many wild animals, particularly of the cat tribe, can appear luminous, so that, seen in a certain kind of gloom, they seem to be like yellow globes. And that was what these were.
"Huh!" said Bobolink to himself, after he had watched these queer glowing balls of fire move several times, that proved in his mind they must be the eyes of an animal: "Guess I better give Paul the high sign, and let him figure out what it is."
And with that he started to creep into the camp, leaving his post for the time being unguarded; for with three other sentries on duty Bobolink did not imagine there could be any danger in his withdrawing from the line.