“Nor I. Wonder what causes it?”
“Beyond me.”
They stood for some time gazing at the varicolored mounds. Then Joe turned about.
“Better get back to camp,” he suggested. “Breakfast may be ready.”
They were about to retrace their footsteps when they heard a rustling sound but a few feet away.
“What’s that?” muttered Bob, sensing that danger was at hand.
The youths glanced around—and then shrank back in horror!