These days, AI-generated videos of baby elephants are everywhere I look. This feels like a waste of time to me, because real elephants are already completely amazing! It's more than just their awesome size. They're intelligent, social, resourceful, and full of surprises.
One part of the elephant that stands out is the trunk. An elephant trunk is like the Swiss army knife of the animal kingdom! An elephant can use its trunk to delicately handle fragile items or use it to rip trees from the ground. They use their trunks to help pick up food and water, sense their surroundings, and communicate long distance with other elephants. How is this range of activities possible from a nose and upper lip?
The answer lies in the trunk's structure and sensory organs.
For starters, an elephant's trunk has exactly zero bones inside of it! Instead, the trunk is composed of 40,000 muscle bundles arranged in different directions. For comparison, the entire human body has around 600 muscles. This allows for a remarkable level of control and range of motion. Elephants can use their trunks to lift, push, and manipulate objects of almost any shape and size.
The elephant's trunk also has sensory organs that can detect low-frequency rumbles. By placing the tip of its trunk on the ground, an elephant can listen to the rumblings and vocalizations made by elephants miles away!
One weird method of trunk-based communication is both fascinating and a little disgusting. If an elephant finds a dung pile from another elephant, they can pat their trunk near the waste pile. Then they put the end of their trunk near the roof of their mouth, where a sensory organ detects information about the other elephant's status, age, and health. It's like a social media bio written in poop!
When talking about elephant trunks, we can't forget about the nasal passages. Elephants can adjust their trunk muscles and nasal passage lining to create the perfect amount of suction, allowing it to handle delicate objects. They can also use it to suck up about 10 liters of water that they can then spray into their mouths to drink. (Despite the cartoons we have all seen, elephants can't "drink" through their trunks.)
The skin of an elephant trunk is tough, which means it is less sensitive to touch signals. So how does it work so carefully with delicate objects? Elephant trunks are sensitive because they are covered in special whiskers surrounded by nerves. The way the whiskers bend when they connect with an object sends extra information about the object's size, shape, and weight to the elephant's brain.
Here is a graph comparing the diameter, or thickness, of trunk whiskers of both Asian and African elephants, measured at different places on their trunks.
Here are some questions I'd have looking at this graph:
💡The ventral side of the elephant's trunk is the underside. The dorsal side is the top (think of a dolphin's "dorsal fin"). Do African elephants have thicker whiskers on the dorsal side or ventral side? How does this compare to Asian elephants?
💡Which trunk region has the greatest difference in whisker thickness between the Asian and African elephant? Where do you predict this region of the trunk is located?
💡African elephants have two muscular areas at the tip of their trunk used for pinching objects. Asian elephants have only one muscular area at their trunk tip. Do you notice any differences in trunk tip whisker thickness between the two elephant types?