" A deep sound shook the air, a sound Janner had heard before but couldn’t place. He looked left and right, expecting something to emerge from the trees, wondering for a moment whether he was hearing things that weren’t really there. But it wasn’t his imagination. Oskar sat up and said, “Ah!” Nia smiled, hurried to the cliff, and looked down at the ocean. Podo, however, groaned and shook his head, then crossed to the far side of the clearing and into the forest. Janner had no time to wonder at this because by then he’d seen them. "

― Andrew Peterson , North! or Be Eaten (The Wingfeather Saga, #2)