A dolphin's "nose," is not what you might typically think. Instead, their real, functional nose is the blowhole on top of its head.
Understanding the Blowhole
Here's a more detailed look at this unique feature:
- Location: The blowhole is positioned on the top of a dolphin's head, not at the front like in most mammals.
- Function: This opening serves as the dolphin's respiratory system. They use it to inhale air into their lungs and exhale used air and water vapor.
- Nasal Septum: When the blowhole is open, the nasal septum (the wall separating the nostrils) is visible.
- Muscular Control: Dolphins have muscles to control the opening and closing of the blowhole, allowing them to effectively regulate airflow and prevent water from entering their lungs.
The Rostrum: The Dolphin's Snout
It's also important to distinguish the blowhole from what might be perceived as the dolphin’s "nose" at first glance:
- Elongated Jaws: Dolphins have elongated upper and lower jaws that form a snout-like structure called a rostrum.
- Common Name Source: This rostrum or snout is what gives dolphins their common name.
- Not a Nose: However, it is important to note that this rostrum is not their nose. It is not used for breathing; instead, it is used for feeding and sensing.
Key Differences
To clarify, here's a quick comparison:
| Feature | Blowhole | Rostrum (Snout) |
|---|---|---|
| Function | Breathing (inhalation and exhalation) | Feeding, sensing |
| Location | Top of the head | Elongated jaws at the front of the face |
| Anatomy | Nasal opening with a septum | Jaws |
In Summary
The term "dolphin nose" is often mistakenly applied to their rostrum. The true nose is the blowhole, an essential opening on top of their head that allows these fascinating creatures to breathe.
