What is different about the mouth structure of ruminants compared to that of humans?

When a human eats we rely heavily on our front teeth to tear, our molars to grind and chew, our mandible to aid this and our tongue to move food from the front of our mouths to the back to prepare it to be swallowed. A ruminant relys heavily on their lips to grasp food and their front teeth which humans do not, we rarely use our lips to aid in the eating process.