Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammal
- Order
- Artiodactyla
- Family
- Delphinidae
- Genus
- Stenella
- Species
- Stenella longirostris
Habitat
Gray's spinner dolphins inhabit tropical and subtropical waters of the Pacific and Indian Oceans, preferring deep offshore areas and pelagic zones. They are often found near islands or continental shelves, avoiding very shallow coastal waters. This species thrives in warm waters above 20°C, where they can access abundant prey.
Diet
They primarily feed on small fish such as lanternfish and anchovies, as well as squid and shrimp. Feeding occurs in large groups using echolocation to herd and capture prey, typically at dawn and dusk in deeper waters. This hunting strategy allows them to efficiently exploit schools of fish in open ocean environments.
Behavior
Gray's spinner dolphins are highly social, forming pods of 10 to 200 individuals that travel and hunt together. They are known for acrobatic behaviors like spinning, leaping, and bow-riding near boats, which are often displays of play or communication. These dolphins are diurnal, active during the day for feeding and socializing, and tend to rest in calmer waters at night, showing little territorial behavior.
Conservation Status
The IUCN status is Least Concern, but populations are declining in some areas due to bycatch in fisheries and marine pollution. Major threats include habitat degradation from climate change and boat strikes.