For me, going to Blockbuster or Hollywood Video to look for a movie is always an interesting experience. It never fails- I will see a movie with a chimp on the cover “smiling”. This facial expression that we, as humans, understand as a happy face is not a happy face for a chimpanzee. A “human smile” displayed by a chimpanzee is actually a “fear grimace” and is displayed when a chimp is afraid or excited. When a chimpanzee is used for entertainment purposes, they are trained to fear grimace for the camera. I thought, in this regard, I would post some pictures to demonstrate the difference between a fear grimace and a chimpanzee smile.
Below is an older picture of Jody displaying a fear grimace. If I had to guess, I would say she was afraid someone might steal her watermelon…
Here is a picture of Jody with a playface or a chimpanzee smile. THIS is a happy chimpanzee:
and a happy Foxie: