Diego smiled. “Señor, please. There are only birds here.” At that moment, they heard a deep, rumbling sound, an unearthly cry that arose from somewhere in the forest below them. After a moment, the cry was answered, from another part of the forest. Diego’s eyes widened. Levine mouthed: Birds? Diego was silent. He bit his lip, and stared out at the forest. To the south, they saw a place where the tops of the trees began to move, a whole section of forest that suddenly seemed to come alive, as if brushed by wind. But the rest of the forest was not moving. It was not the wind.