Do pigs breathe in air with their mouths?

Pigs primarily breathe through their noses, which helps them filter and warm the air before it enters their lungs. However, they can also breathe through their mouths, especially if they are experiencing stress, exertion, or nasal congestion. Mouth breathing is less efficient for them compared to nasal breathing. Overall, while it's possible for pigs to breathe through their mouths, it's not their preferred method.