A snake’s organs are elongated to fit in their long, thin bodies
Image: Wikimedia Commons/Uwe Gille, David Shaw Remix CC-BY 2.5
When humans breathe, a muscle under our lungs, called the diaphragm, pulls down. This makes our lungs bigger, and air is sucked in through the nose and mouth to fill them. Snakes breathe a bit differently – they make their lung bigger by expanding their ribs instead.
Recently, scientists from Australia and the United States took a closer look at how boa constrictors breathe. They squeezed small sections of these snakes while taking videos and scans, including X-rays. That way, they could see how the snakes’ ribs moved as they breathed.
So what happens when a boa constrictor gets squeezed? The snake will expand their lung using only some of their ribs. If a part is getting squeezed, they breathe with ribs higher up or further down instead. And when scientists measured nerve signals, they discovered the squeezed bits of snake weren’t even trying to breathe!
Surviving the squeeze
Boa constrictors have some helpful tricks when it comes to breathing under pressure. When they’re constricting their prey to death, they probably aren’t using their entire body to squeeze. And the bits that aren’t squeezing can be used to breathe instead.
But this research helps explain how snakes survive other squishes too. Snakes are famous for swallowing their prey whole, even when the meal weighs more than the predator! A big dinner will squeeze a snake hard from the inside. But snakes don’t suffocate on their snacks – they just breathe around them!
If you’re after more science news for kids, subscribe to Double Helix magazine!