"Was it a hawk?" asked Fly cautiously, crowding nearer to Carl.
"I've heard hawks cry and eagles scream, but never like that," returned the Indian, his voice growing louder.
"What was it then?" asked Fly in a natural voice, gathering courage as the conversation progressed.
"I never heard one, of course," replied Carl slowly, "but I think that was the Thunder Bird."
"That's just what it was," exclaimed Dunk at once.
For some moments nobody spoke, then Carl said reflectively: "I suppose that Indian friend of ours heard it too, and is on the trail."
"You'd better look out or he'll get it before you do," commented the captain, who had heard of the mysterious stranger.