Wiktionary
spinner dolphin
n. A species of small dolphin, ''Stenella longirostris''.
Wikipedia
Spinner dolphin
The spinner dolphin (Stenella longirostris) is a small dolphin found in off-shore tropical waters around the world. It is famous for its acrobatic displays in which it spins along its longitudinal axis as it leaps through the air. It is a member of the family Delphinidae of toothed whales.