Dolphins vs. porpoises: What’s the difference

In general, dolphins are much bigger than porpoises. The largest dolphin species is the orca, also known as the killer whale, which weighs a whopping 1,360 to 5,400 kilograms (3,000 to 12,000 pounds) as an adult. For comparison the smallest porpoise species-which is the smallest of all cetaceans-is the vaquita, which weighs up to 54 kilograms (120 pounds) as an adult and measures only 1.3 to 1.5 metres (four to five feet) long.

One of the easiest ways to tell dolphins from porpoises is by looking at their faces and bodies. Dolphins have prominent beaks, while porpoises have more rounded heads. This means they have longer noses and bigger mouths. Additionally, dolphins' dorsal fins are more curved and hook-shaped, whereas porpoises have dorsal fins that are more triangular. They also have different types of teeth. Dolphins' teeth are pointed and cone-shaped, while porpoises have teeth shaped like spades. Generally, dolphins are longer and leaner than porpoises.

Porpoises are also thought to be less social and less talkative than dolphins. Dolphins communicate through whistling sounds made through their blowholes, but scientists believe porpoises do not engage in this behaviour. It's possible that porpoises' blowholes have structural differences that make it impossible.

Compared to dolphins, porpoises tend to grow more quickly, breed at earlier ages, and live shorter lives. Dolphins are also more likely to approach boats and be curious about humans. Porpoises are shy and avoid boats, with the exception of Dall's porpoise.

What do dolphins and porpoises eat?

Toothed whales, including dolphins and porpoises, are carnivores that hunt and feed on other sea creatures. Both dolphins and porpoises consume a variety of prey, including schools of fish like herring, sand lance, mackerel, and squid.

The world's largest dolphin-the orca or killer whale-is a powerful predator. Some consume other marine mammals like seals, some eat only fish, and others prey on sharks and rays.

Vaquitas, the world's smallest porpoises, mainly eat fish, squid, and crustaceans. They are lower on the food chain and are sometimes preyed on by orcas and sharks.

Are dolphins and porpoises endangered?

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