Because the left lung needs to be smaller to make room for the heart, there are differing numbers of lobes on the right and left lungs of fetal pigs.
Each side of the pig lung is divided into a number of lobes. In contrast to humans, who have three lobes on one side and two on the other, pigs have four lobes on their right lung and three on their left.
Compared to humans, who have three right and two left lobes, swine lungs have two left and four right lobes.
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