It is thought that, by rearing up on their hind limbs and using their long arms and fingers, they could reach overhead to grasp high leaves and branches and pull them down to their mouth. They then would use their powerful jaws and striated teeth to grind the tough leaves.
It is believed that, by standing on their hind legs and utilizing their long arms and fingers, they could reach high leaves and branches to grasp them and pull them down to their mouths. They would then use their strong jaws and striated teeth to crush the tough leaves.