Something similar happened in the US in a Zoo in 1996 in that indecent a female gorilla actually carried the kid to safety.
http://abcnews.go.com/US/gorilla-carries-year-boy-safety-fell-enclosure-1996/story?id=39479586
Even though gorillas are the strongest out of the great apes they are actually pretty harmless since they are primarily herbivores. Chimpanzees are a lot more dangerous since they regularly also consume meat and they hunt other mammals in the wild.








