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Dolphins

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Conservation status

UCN Red List: Data Deficient (DD)

LIFE SPAN
  • In the Wild: Generally lives between 20-25 years.
  • In Captivity: Can live up to 25 years or more with proper care, though they thrive best in their natural habitat
Body size
  • Length: Typically ranges from 1.8 to 2.4 meters (6 to 8 feet).
  • Weight: Can weigh between 75 to 140 kg (165 to 310 lbs), making them medium-sized dolphins with a sleek and agile build.
Native habitat
  • Geographical Range: Found in tropical and subtropical waters worldwide, including the Indian Ocean, Pacific Ocean, and parts of the Atlantic Ocean. In Sri Lanka, they are commonly seen off the coasts of Mirissa and Kalpitiya.
  • Habitat: Prefers deep, offshore waters but can also be found near coral reefs, islands, and continental shelves.
Diet
  • Fish: Small schooling fish such as sardines and anchovies.
  • Cephalopods: Such as squid, which they hunt during nighttime foraging trips.
  • Crustaceans: Occasionally consuming shrimp and other small marine invertebrates.
Spinner Dolphin (Stenella longirostris)

The Spinner Dolphin, a captivating cetacean, is a celebrated inhabitant of Sri Lanka’s coastal waters. Famous for their acrobatic spins and social nature, these dolphins are a highlight for marine wildlife enthusiasts.

Physical Characteristics: The Spinner Dolphin is known for its slender build and distinct long beak. These dolphins typically measure between 1.8 to 2.4 meters (6 to 8 feet) in length and weigh between 75 to 140 kg (165 to 310 lbs). Their coloration features a dark gray dorsal area, light gray sides, and a white underside, aiding in camouflage while swimming.

Habitat: Spinner Dolphins thrive in the warm tropical and subtropical waters surrounding Sri Lanka. They are often spotted in deeper offshore waters but also frequent coastal areas and are known to inhabit regions around coral reefs and islands, particularly off the coasts of Mirissa and Kalpitiya.

Diet: The Spinner Dolphin’s diet is diverse and consists primarily of:

  • Fish: Small schooling fish such as sardines and anchovies.
  • Cephalopods: Including squid, which are a significant part of their nocturnal feeding.
  • Crustaceans: Occasionally consuming shrimp and other small marine invertebrates.

These dolphins use echolocation to locate their prey and often hunt in coordinated groups, demonstrating remarkable teamwork.

Behavior: Spinner Dolphins are highly social animals, forming pods that can range from a few individuals to several hundred. They are renowned for their spinning leaps, which can involve multiple rotations in the air. These displays are believed to serve various purposes, including communication, social bonding, and parasite removal. Spinner Dolphins are crepuscular, meaning they are most active during dawn and dusk.

Conservation Status:

  • IUCN Red List: Data Deficient (DD). While their overall population status is unclear, localized threats include bycatch in fishing nets, habitat degradation, and disturbance from boat traffic.

 

Lifespan: In the wild, Spinner Dolphins generally live between 20-25 years. In captivity, with proper care, they can live up to 25 years or more.

Conservation Efforts: Efforts to protect Spinner Dolphins focus on:

  • Marine Protected Areas: Establishing zones with regulated human activity to safeguard their habitats.
  • Sustainable Fishing Practices: Reducing bycatch and promoting dolphin-friendly fishing techniques.
  • Public Awareness: Educating local communities and tourists about the importance of conservation and responsible wildlife tourism.