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River dolphins are relatives of the Delphinoidea. Oceanic dolphins range in size from the 1.7-metre-long (5 ft 7 in) and 50-kilogram (110-pound) Maui's dolphin to the 9.4-metre (31 ft) and 10-metric-ton (11-short-ton) orca, the largest known dolphin. Several species exhibit sexual dimorphism; the males are larger than females.
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).
The Irrawaddy dolphin is a slow swimmer, but swimming speeds of 20–25 kilometres per hour (12–16 mph) were reported when dolphins were being chased in a boat. [11] In a year, females can sometimes swim as fast as average of 45 km, males can swim up to average of 100 km. [ 12 ] : 2
Orca gladiator (Bonnaterre, 1789) The orca (Orcinus orca), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. It is the only extant species in the genus Orcinus and is recognizable its black-and-white patterned body.
The beak of northern right whale dolphins is short and well-defined, characterised by a straight mouthline. The flippers are small, curved, narrow and pointed. The tail flukes are triangular and, like the flippers, rather pointed. Adults are 2–3 meters (6.6–9.8 ft) long and weigh between 60–100 kg (130–220 lb).
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. [ 4 ] The white-sided dolphin's color variations are unique amongst the standard hues of white, grey, black and blue seen ...
An average swim speed during travel has been measured at about 4 km/h (2.5 mph). [7] In Angola and Guinea, some individuals appear to exhibit high site fidelity and strong association patterns. [5] Atlantic humpback dolphins communicate similarly to other dolphin species via echolocation. [6]
Swimming with dolphins. Human pulled along by captive dolphin. The popularity of swimming with dolphins increased in the 1980s and 1990s, occurring in over 65 countries, [1] both as a form of therapy as well as a tourist activity. [1][2] Proponents of dolphin-assisted therapy (DAT) say that interacting with dolphins can help to treat mental and ...