Did you know that gorillas are fussy eaters? They know what they like, and that's all they will usually eat. With some plants, they may eat only the leaves. With others, only the stalk or the roots. As they eat, they may carefully stack the parts they don't want in a neat pile.
Bonus fact: It is rare for gorillas to drink water in the wild. Most of the time, they get all the moisture that they need from the plants they eat.