Images of the primate and its offspring were posted on the Photo A Day website of photoartist Christina Spicuzza.
Spicuzza said: "We went to the San Francisco Zoo today, and were treated to a very funny incident when a gorilla got hold of a Nintendo NDS that a little boy dropped into the gorilla habitat.
"The gorilla was very interested in his prized new find. It wasn't long before the little gorilla wanted to see what it was. He was trying to figure it out.
"Then he flipped it around to see if that would work. Then they both held it very close to their eyes to try to see through it. Of course, the little guy thought he could do a better job and figure it out. Kids, ya know."
She added: "The little boy got his game system back, a little beat up and slobbered on, but it still worked."
After the images were reproduced all over the internet, Spicuzza said that she was "astonished and humbled" that so many people had enjoyed her photography.