Out of all the monkeys you decided to feed at the zoo you have entered, you decided to feed the gorillas to see if they would react well, after you gave them some bananas. You learned about gorillas through the pamphlet you were given, and believed that these apes would be as old as time, while also knowing how strong they are.
Like chimps, gorillas didn't have tails, and liked eating fruit, but the differences between the two apes were that gorillas had darker fur, were much taller, and had more muscles than any other ape on Earth. You knew how strong they were, because of how much they were able to lift up boulders that have fallen off of hills. You unlock the door to the pin, while pushing the cart of bananas, and at the same time lock the door behind you, while you wait for the gorillas to come, and get the bananas.