Komodo dragons do not chew their food. They eat by biting and pulling off large chunks of flesh and swallowing them whole. They can swallow smaller prey, up to the size of a goat, whole. This is because they have flexible jaws and skulls, and their stomachs can expand. Komodo dragons make much saliva to help the food move easily, but swallowing still takes a long time (15–20 minutes to swallow a goat). Komodo dragons may try to swallow faster by running and pushing the dead animal in its mouth very hard against a tree. Sometimes a lizard hits the tree so hard that it gets knocked out. Dragons breathe using a small tube under the tongue that connects to the lungs. This allows it to continue breathing even while swallowing large things. Komodo dragons can eat up to 80 percent of its body weight in one meal. After swallowing its food, it drags itself to a sunny place to speed up digestion so the food does not rot and poison the dragon. Large dragons can survive on as little as 12 meals a year. After digestion, the Komodo dragon vomits the horns, hair, and teeth of the animal it ate. This vomit is covered in a smelly mucus. After vomiting, it rubs its face in the dirt or on bushes to get rid of the mucus. This suggests that komodo dragons dislike the smell, just like humans do.