Gorillas are herbivore meaning it eats plants and other green leafy material. In the jungles they get their nutrition from fruits and other greenery. Often in the Congo the silver-backs will indulge...
Well, they live in the jungle full of various trees, plants, etc. that they'll sit by or if it's a tree pull down and munch. Gorillas don't have any trouble because they are not carnivores they are...
They dig earth to get tender shoots of bamboo ,take cortex and pith of tender stems , also eat fruits , there are differences in diet of different subspecies .