Snakes do not chew their food into bite-sized pieces. Instead, they swallow their food whole, even if the food is larger than their head. This is much like a human swallowing a large watermelon whole. How do they do that?
Answer:
This is a Bull Snake. Like other snakes, its skull is built to flex and come apart. When it eats, the lower jaw unhinges and separates in the front, forming two halves that move independently. The snakes teeth curve towards the back of its mouth. The snake bites it food, and then starts a process known as jaw walking. The snake moves one jaw forward and hooks the teeth into its food. Then it pulls that jaw backwards, pulling the food along with it. Then the other jaw is moved forward, hooks its teeth, and then pulls backwards. By alternating the movement of its jaws, the snake pushes the food down its throat.
When you look at a snake skeleton, you also notice that unlike us, its ribs do not connect. That lets the ribs spread tremendously, allowing the snake to swallow very large prey.
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