Golfo Dulce is considered a tropical fjord, where attributes and characteristics of both, coastal and oceanic habitats come together. This small inner sea is located in the OSA peninsula in the southern Pacific of Costa Rica. The gulf has been shaped by tectonic forces and has a dominant coastline in the north that has a steep, forested, rocky shore
A third sub-habitat would be represented by the Transitional-Oceanic Area just outside Golfo Dulce.
The marine mammal fauna in Golfo Dulce, as reported by the cetologist Alejandro Acevedo in 1996, comprises two baleen whales: Balaenoptera edeni and Megaptera novaeangliae, latter being the Humpback whales, which are relatively common during their breeding and calving season. Sightings of southern and northern Humpbacks have been recorded.
There are three species of odontocetes in the waters of Golfo Dulce: the resident Bottlenose dolphins (Tursiops truncatus) and the coastal form of the Pantropical Spotted dolphin (Stenella attenuata), also the occasionally seen False Killer Whales (Pseudorca crassidens). Bottlenose Dolphins remain close to river mouths, where they can get access to a predictable and concentrated food source, along the edges of Golfo Dulce are Mangroves and estuaris full of wildlife such as momkys,sloths,tropical birds and much more
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