Dolphins vs. Porpoises: What's the Difference?

Dolphins and porpoises are often mistaken for one another, and it’s easy to see why. Both are sleek, intelligent marine mammals that belong to the cetacean family. Yet despite their similarities, these two creatures come from different branches of the dolphin family tree and have important distinctions in looks, behavior, and biology.

The easiest way to spot the difference lies in their appearance. Dolphins tend to have elongated beaks, curved dorsal fins, and slender, streamlined bodies. Porpoises, on the other hand, have shorter snouts, more triangular dorsal fins, and stockier builds.

Another key difference is in their teeth: dolphins have cone-shaped teeth, while porpoises have flat, spade-shaped ones—adapted to their different feeding styles and prey preferences.

Behaviorally, dolphins are far more social and acrobatic. They're known for riding waves, leaping out of the water, and forming large pods. Porpoises are shyer and less showy, typically traveling in small groups and avoiding boats.

When it comes to sound, dolphins are loud and chatty, using a wide range of whistles and clicks for communication and echolocation. Porpoises are much quieter, emitting higher-frequency clicks that are harder for humans to detect.

Geographically, both dolphins and porpoises inhabit oceans around the world, but they tend to favor different waters. Dolphins are more widespread and adaptable to both warm and cold seas, while porpoises often prefer cooler, coastal regions.

Understanding the differences between dolphins and porpoises not only helps us identify them correctly but also deepens our appreciation of the rich diversity in marine life. So next time you see a sleek shape gliding through the waves, take a closer look—you might be spotting a porpoise in dolphin’s clothing.