Gorilla Gestures

No, I don't mean excedingly large human gestures! Check out this wonderful website by Joanne Tanner on gestures observed in gorillas, particularly at the San Francisco Zoo. I was particuarly entranced to find that one of the gorillas has a gesture of looking at her wrist, as if looking at her watch (the "wrist glance") to indicate a delay in action. They must see many visitors a day do it, after all.