Monkeys put up a "Don't Disturb" sign with their hands

Some monkeys in a British zoo have been getting up to some very unusual behavior. They cover their eyes with their hands when the Sun isn't even shining down on them, and they keep their eyes open the whole time, suggesting this isn't a physical reaction but actually a form of social interaction. The zookeepers… » 2/08/11 1:50pm 2/08/11 1:50pm