Head to head
Common Dolphin vs Spinner Dolphin
The common dolphin and spinner dolphin are both highly social, acrobatic dolphins found across warm ocean waters worldwide, but each has become known for a completely different signature behaviour.
| Common Dolphin | Spinner Dolphin | |
|---|---|---|
| Scientific name | Delphinus delphis | Stenella longirostris |
| Signature behaviour | Forming extremely large groups | Multi-rotation leaping and spinning |
| Typical group size | Can number into the thousands | A few to several hundred |
| Distinctive marking | Hourglass pattern along the sides | Slender body, long thin beak |
| Daily activity pattern | Active day and night | Hunts at night, rests in bays by day |
| Conservation status | Least Concern | Least Concern |
| Population trend | Stable | Decreasing |
| Diet | Carnivore | Carnivore |
Common Dolphin vs Spinner Dolphin: common questions
Which dolphin forms bigger groups, the common dolphin or the spinner dolphin?
The common dolphin forms by far the larger groups, sometimes numbering into the thousands of individuals, among the largest group sizes documented in any dolphin species, while the spinner dolphin typically travels in groups ranging from a few individuals to a few hundred.
Why does the spinner dolphin spin and the common dolphin doesn’t as much?
Researchers still debate the exact purpose of the spinner dolphin's signature rotating leap, with theories including communication, dislodging parasites, and play, while the common dolphin's acrobatics are more typically tied to cooperative hunting and group herding behaviour rather than solo aerial displays.
Where do these two dolphins rest during the day?
The spinner dolphin has a well-documented pattern of resting in calm, sheltered bays during daylight hours after hunting through the night, while the common dolphin does not show the same strong daytime resting pattern, remaining active across a broader range of times.