Water moves through a pachyderm’s trunk at the rate of flow of 24 shower heads. Whether or not it’s possible to teach an old elephant new tricks, a 34-year-old pachyderm at Zoo Atlanta has recently taught researchers a thing or two about how elephants suck up food and water with their trunks. For one thing, an elephant doesn’t use its trunk as a simple straw. It can also dilate its nostrils to boost its trunk’s carrying capacity while snorting up water. And that means it takes fewer snorts than expected to stock up on water that they use to drink and hose themselves down. Other than aquatic creatures, not many animals other than elephants use a type of suction feeding that doesn’t depend on lung power alone. Elephants are the only living land animals to evolve a long, boneless appendage like a trunk. A septum stretching the length of the trunk separates it into two nostrils. But detailed knowledge of what happens inside that muscular structure during feeding has been sorely lacking. Using ultrasound to monitor what was happening inside the trunk during feeding. In some trials, the elephant snorted up volumes of water, which in some cases had bran mixed in. the ultrasound revealed that each nostril’s available volume ballooned by as much as 64 percent, up from the trunk’s original capacity of about five liters(although the elephant used only a small fraction of this extra space). Flow rate of water through the trunk averaged about 3.7 liters per second, or the equivalent of the amount of water pouring out of 24 shower heads at once. In other trials, the elephant was offered small cubes of rutabaga of various sizes. When offered just a few cubes, the elephant picked them up with the prehensile tip of the trunk. But when offered piles of cubes, she switched into vacuum mode. Here, the nostrils don’t expand, but rather the elephant breathes in deeply to hoover up the food. Based on the amount and rate of water snuffed up by the elephant, the researchers estimated that airflow through the narrow nostrils could at times exceed 150 meters per second — more than 30 times as fast as a human sneeze.

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