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A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
[5] [6] The gestation period is 11 months and lactation lasts for about 18 months — both typical figures for dolphins. [4] Atlantic white-sided dolphins are known to live for at least 17 years. [4] The key distinguishing feature is the dolphin's coloration—a white to pale-yellow patch is found behind the dorsal fin on both sides of the body ...
The adult striped dolphin eats fish, squid, octopus, krill, and other crustaceans. Mediterranean striped dolphins seem to prey primarily on cephalopods (50-100% of stomach contents), while northeastern Atlantic striped dolphins most often prey on fish, frequently cod. They mainly feed on cephalopods, crustaceans, and bony fishes.
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Brain of a human (left), compared to that of a black rhinoceros (center) and a common dolphin (right). Elephant brains also show a complexity similar to dolphin brains, and are also more convoluted than that of humans, [20] and with a cortex thicker than that of cetaceans. [21]
Process used to collect a dolphin's view of humans underwater: Reid explains , "When a dolphin scans an object with its high frequency sound beam, each short click captures a still image, similar ...
In addition to being caught for human consumption, the dolphins are also used as bait for long-line sword fishing and crab fisheries. It is reported that between 1,300 and 1,500 Chilean dolphins are harpooned in the Strait of Magellan each year. Use as bait was particularly popular until the 1990s, and hunting of Chilean dolphins is now illegal ...