Although gorillas mainly eat a vegetarian diet, they are real powerhouses. As their diet is very rich in fiber, but often low in nutrients, they spend much of their time foraging and feeding. In order to digest the fiber-rich food well, they lay down and rest for long periods.
The film industry has left us with a dubious image of gorillas. In spite of their enormous physical strength, in reality gorillas avoid conflict as much as possible. They mostly communicate via body language such as eye contact or gestures.