The Jungle Book by Rudyard Kipling Chapter 5 Page 29

ravine itself. From that height you could see across the tops of the trees down to the plain below; but what Mowgli looked at was the sides of the ravine, and he saw with a great deal of satisfaction that they ran nearly straight up and down, while the vines and creepers that hung over them would give no foothold to a tiger who wanted to get out.

“Let them breathe, Akela,” he said, holding up his hand. “They have not winded him yet. Let them breathe. I must tell Shere Khan who comes. We have him in the trap.”

He put his hands to his mouth and shouted down the ravine — it was almost like shouting down a tunnel — and the echoes jumped from rock to rock.

After a long time there came back the drawling, sleepy snarl of a full-fed tiger just wakened.