The costero (Sotalia guianensis, also known as the Guiana dolphin and the estuarine dolphin) is a dolphin found in the coastal waters to the north and east of South America, and east of Central America. The costero is a member of the oceanic dolphin family (Delphinidae).

The Guiana Dolphin (Sotalia guianensis) is frequently described as looking similar to the bottlenose dolphin. The dolphin is colored light to bluish grey on its back and sides. The ventral region is light gray. The dorsal fin is typically slightly hooked, with a triangule shape. The beak is well-defined and of moderate length.

Guiana Dolphins are very conspicuos, considered a "shy" species. Does not bow ride on boats and normally swims away from them.

Researchers have recently shown that the costero has an electroreceptive sense, and speculate this may also be the case for other odontocetes.

  • Size

    It is typically smaller, at only up to 2.1 m (6.9 ft) in length.

  • Feeding

    They feed on a wide variety of fish, shrimps and squid.

  • Life History

    Studies of growth layers suggest the species can live up to 30 years.

  • Behavior

    This species forms small groups of about 2-10 individuals, occasionally up to 100, and swim in tight-knit groups, suggesting a highly developed social structure. They are quite active and may jump clear of the water (a behavior known as breaching), somersault, spy-hop or tail-splash.