I was reading an article about an oil spill in the Black Sea and couldn’t recall what the difference is between dolphins and porpoises…

It essentially comes down to their faces (who can forget Flipper’s famous “grin”?), their fins, and their figures. Dolphins tend to have prominent, elongated “beaks” and cone-shaped teeth, while porpoises have smaller mouths and spade-shaped teeth. The dolphin’s hooked or curved dorsal fin (the one in the middle of the animal’s back) also differs from the porpoise’s triangular dorsal fin. Generally speaking, dolphin bodies are leaner, and porpoises’ are portly.

From the National Ocean Service.

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