FaunaHub

Spinner Dolphin (Stenella longirostris)

Marine mammalDolphin familyHighly intelligentAcrobatic

Spinner dolphin (Stenella longirostris) underwater off Panglao, Philippines.

Spinner dolphin (Stenella longirostris), Philippines.

Image: Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons.

Overview

The spinner dolphin (Stenella longirostris) is a small, slim dolphin of tropical seas, named for its spectacular habit of leaping from the water and spinning rapidly around its long axis — sometimes several rotations in a single jump. It has a long, slender beak and lives in warm oceans around the world.

Spinner dolphins are intensely social and follow a striking daily rhythm, resting in sheltered bays during the day and moving offshore to feed at night.

Conservation note: spinner dolphins are widespread, but some populations are sensitive to disturbance at their resting bays and to fishing interactions. Verify current status at iucnredlist.org and NOAA Fisheries.

Habitat & Range

Spinner dolphins live in tropical and subtropical waters worldwide. Many populations spend daytime hours resting in calm, shallow coastal bays and lagoons, then travel to deeper offshore waters at night to feed, returning to the bays by morning.

Diet

Spinner dolphins feed mainly at night on small fish, squid, and shrimp that rise toward the surface after dark as part of the ocean's nightly vertical migration of small animals. They often dive deep to reach these prey layers and hunt cooperatively.

Behavior

Beyond their famous spins — which may serve to communicate, dislodge parasites, or simply play — spinner dolphins form large, closely coordinated groups. Their daytime rest is a distinctive group behaviour, with the pod swimming slowly and quietly together. They communicate with whistles and clicks and use echolocation to find prey in the dark.

Human Interaction & Conservation

Because resting spinner dolphins gather in accessible coastal bays, they can be vulnerable to disturbance from boats and swimmers, and guidelines in some regions limit approaching resting groups. Fishing interactions have also historically affected some populations. For current status and guidance, consult NOAA Fisheries and the IUCN Red List.

Intelligence & Social Complexity

Spinner dolphins show the high intelligence and social sophistication typical of the dolphin family. They live in large, coordinated groups, synchronise behaviour closely (notably during daytime rest), and rely on echolocation and a rich vocal repertoire to navigate, hunt cooperatively in the dark, and stay in contact. Their structured day-night cycle and group coordination reflect the flexible, learned behaviour for which dolphins are studied.

More photos of the spinner dolphin

A pod of spinner dolphins swimming together in the Indian Ocean.

Pod of spinner dolphins, Indian Ocean.

Image: Giles Laurent, CC BY-SA 4.0, via Wikimedia Commons.

Frequently Asked Questions — Spinner Dolphin

Why do spinner dolphins spin?
Spinner dolphins are famous for leaping and rotating rapidly in the air, sometimes several spins per jump. Researchers think spinning may serve several functions, including communication, shaking off parasites or remoras, and play. The exact balance of reasons is still studied.
Do spinner dolphins sleep during the day?
Many populations rest by day in calm coastal bays, swimming slowly and quietly together, and then travel offshore at night to feed. This day-rest, night-feed rhythm is a hallmark of the species in many areas.
What do spinner dolphins eat?
They feed mainly at night on small fish, squid, and shrimp that move toward the surface after dark. Spinner dolphins often dive deep to reach these prey and hunt in coordinated groups.
Are spinner dolphins intelligent?
Yes. Like other dolphins, they are highly intelligent and social, using echolocation and complex calls to coordinate large groups, rest together, and hunt cooperatively — behaviours that reflect the advanced cognition seen across the dolphin family.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.