They keep him drugged up, and he's still barely controlled. Without the darts every 3 hours, he'd tear everyone else to shreds just to feed the hunger within him.
Makes sense. Evolution gives prey animals eyes with as wide a field of vision as possible, so they can detect predators better. Elephants are too large for predators to mess with and so is big bird.
I had to go look it up. Not sure that picture is accurate, mind, it’s the only one I could find. (Though lots of comments about herds being led by a blind elephant…. I’m sure there’s a joke in there.)
Oscar is a form of Trapdoor Spider. He blends in with his environment until unsuspecting prey is near, then hauls them into his den to consume at his leisure.