Stock photography, photos: Male Gorilla Stock photos of Silverback gorilla in Calgary zoo Photograph: © Larry Cooper Click for a larger image and more information Keywords associated with this stock photo: Calgary, Alberta, zoo, gorilla, ape, cage, watching, observing, learning, imitating, imitation, resemblance, genetic, similarity, copy, indifference, captive, irony, frustration, anger, freedom, intelligent, intelligence, smart, related, ignoring, refusal, back, ignore, vertical