The authors reported that other snake species likely use the same trick in breathing while constricting and swallowing their prey. Moreover, the trick also likely helps boas survive the process of swallowing and digesting large prey, given that its size could restrict the movements of their ribs. "It doesn't seem like you could evolve constriction to kill really big things if you're compromising lung ventilation," Capano told Live Science. The team suggests that the bag-like section of the snakes' lungs at its rear part operates like a bellows to air through the front part of the lungs, which is at the front side of the snake where gas exchange happens.ĪLSO READ: Rare Snake Died While Eating A Giant Centipede! Serpent's Last Meal Got Stuck on Its Mouth The Trick Likely Contributed to the Success of Snake EvolutionĬapano, the study's first author, said that the snakes' ability to control which section of their ribcage is involved in breathing probably allowed boa constrictors to successfully evolve into their present forms. When they take it off, the snakes would stop moving in the back and start breathing to the front. Capano noted that the snakes would switch to breathing with a set of ribs back towards the tail when they put the blood pressure cuff on the front section of the snakes. The team monitored the nerve signals using X-ray videos that let them watch bone movement inside the snakes. Capano said it was like putting a tiny helmet on the snake to measure the airflow and see how it was breathing. In their study, titled " Modular Lung Ventilation in Boa Constrictor, " published in the Journal of Experimental Biology, researchers described how they put blood pressure cuffs on different parts of the bodies of the snakes to prevent their ribs from moving. Researchers said that there is a chance that their ribs can not move during this time because they are at full capacity. When a snake swallows its prey, its rib cage also expands wide open to accommodate the large animal. The part of their lungs nearest to their heads are rich in blood vessels because it is where gas exchange seems to take place, while the parts of the lung near the tail resemble an empty bag. Snakes have lungs that are long and stretch down through their length. Per NPR, boa constrictors have over 200 pairs of ribs running down the length of their bodies and breathe by rotating the muscles of their rib bones and pumping air in and out. Researchers led by biologist John Capano from Brown University attached metal markers on the ribs of three boa constrictors to track how these ribs move over different parts of the lungs of the snakes. Snakes Use Their Rib Cage and Blood Pressure to Avoid Suffocation (Photo : VANDERLEI ALMEIDA/AFP via Getty Images)Ī recovering boa constrictor feeds on a mouse at the Animal Hospital at the Niteroi Zoo, some 25 kms north of Rio de Janeiro, Brazil on August 5, 2009.
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