" He had run into a huge troop of spider monkeys upriver, much bigger than the family above my camp. “These are the first animals hunted out,” he said. “When you see spider monkeys who don’t run away but come and look at you, that is exceptional.” Later, Chris Fisher went downriver and ran into another large troop of monkeys, who were sitting in a tree above the river eating flowers. They screeched and shook branches at him. When the inner primate in Chris emerged and he began hooting and shaking bushes back at them, they bombarded him with flowers. "

― Douglas Preston , The Lost City of the Monkey God