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The common dolphin (Delphinus delphis) is the most abundant cetacean in the world, with a global population of about six million. [3] Despite this fact and its vernacular name, the common dolphin is not thought of as the archetypal dolphin, with that distinction belonging to the bottlenose dolphin due to its popular appearances in aquaria and the media.
A Pacific white-sided dolphin flips out of the water in the Cordell Bank National Marine Sanctuary off California. These dolphins keep close company. [17] White-sided dolphins swim in groups of 10 to 100, and can often be seen bow-riding and doing somersaults. [6] [18] Members form a close-knit group and will often care for a sick or injured ...
An Atlantic white-sided dolphin off the coast of Cape Ann, Massachusetts. The Atlantic white-sided dolphin is built slightly 'thicker' compared to other oceanic dolphins; they are nearly indistinguishable from the Pacific white-sided dolphin, despite the fact that they are only very distantly related phylogenetically. [3]
The northern right whale dolphin is the only dolphin in the Pacific with this property. Similarly, the Southern is the only finless dolphin in the southern hemisphere. The two species can be readily distinguished (apart from the geographical separation in their ranges) by the extent of the whiteness on the body.
The Guiana dolphin is very similar in appearance to the closely related Tucuxi (Sotalia fluviatilis) with most differences only apparent in skull shape and body size. The Guiana dolphin is the larger of two at a maximum mass of 121 kilograms versus 53 kilograms for the tucuxi.
The creature is dark in coloration and up to 5 cm (2.0 in) long. [3] It hangs from tails, dorsal fins, flippers, and less commonly rostrums and baleen plates/teeth.In a sample population of the dolphin Stenella coeruleoalba, by far the most frequent site of occurrence were the flukes. [4]
The common bottlenose dolphin or Atlantic bottlenose dolphin (Tursiops truncatus) is one of three species of bottlenose dolphin in the genus Tursiops.The common bottlenose dolphin is a very familiar dolphin due to the wide exposure it receives in human care in marine parks and dolphinariums, and in movies and television programs. [5]
According to a study in 1971, Peale's dolphin and the Cephalorhynchus species are the only dolphins that do not whistle (no acoustic data are available for the hourglass dolphin). Peale's dolphin also shares with several Cephalorhynchus species the possession of a distinct white "armpit" marking behind the pectoral fin.
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