1 Most of us have seen a dog staring at, sometimes snarling at, and approaching a reflection of it self. 2 For most animals, seeing their own image in a mirror acts as a social stimulus. 3 But does the dog recognize itself, or does the reflection simply signal a potential companion or threat? 4 The evidence indicates the dogs and almost all other nonhumans do not recognize themselves. 5 In his series of experiments, however, Gallup has shown yhat the chimpanzee does have this capacity. 6 Gallup exposed chimpanzees in a small cage to a full-length mirror for ten consecutive days. 7 It was observed that over this period of time the number of self-directed responses increased. 8 These behaviors included grooming parts of the body while watching the results, guiding fingers in the mirror, and picking at teeth with the aid of the mirror. 9 Describing one chimp, Gallup said, 'Marge used the mirror to play with and inspect the bottom of her feet from the top of the cage. She was alsoobserved to stuff celery leaves up her nose using the mirrow for purposes of visually guiding the stems into each nostril.