I was gonna object that it’s a vegan diet, because they’re presumably not gonna do eggs or milk, but apparently not strictly vegetarian either:

Mountain gorillas spend about a quarter of their day eating, mainly plants. Around 85% of their diet is made up of leaves, shoots and stems, but gorillas can also eat larvae, snails, ants, and even roots, barks and rotting wood (a good source of sodium/salt).

https://www.wwf.org.uk/learn/fascinating-facts/gorillas