They’ve evolved to make those proteins themselves, but that requires more energy on their part. The thing is, we eat a lot less physical food than they do. Grasses and fruit don’t have a lot of calories, and because gorillas are so big, they have to almost CONSTANTLY be eating, and they don’t have the stamina we do. They can be big and strong for a bit, or move quickly for short bursts, but they spend most of their time just sitting around and eating so they don’t starve to death.
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