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The brain to body mass ratio (not the encephalization quotient) in some members of the odontocete superfamily Delphinoidea (dolphins, porpoises, belugas, and narwhals) is greater than modern humans, and greater than all other mammals (there is debate whether that of the treeshrew might be second in place of humans). [8] [9] In some dolphins, it ...
Common dolphin (swimming) 55–64 km/h (34–40 mph) [n] Common dolphins are the fastest marine mammals. When reaching their top speed, they take very short breaths. As an example, fin whales, which are much larger, can empty and refill their lungs in 2 seconds Tiger: 56–64 km/h (35–40 mph) [o]
As part of the family Delphinidae, the species is more closely related to other oceanic dolphins than to other whales. [12] They are sometimes referred to as 'blackfish', a name also used for other whale species. 'Grampus' is a former name for the species, [13] but is now seldom used.
A whale's blowhole connects to its lungs to inhale oxygen. Some whales, such as the sperm or Cuvier's beaked, can spend over an hour between breaths , the Whale and Dolphin Conservation reports.
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).
In comparison to cetaceans, sirenians, and pinnipeds, which entered the water approximately 50, 40, and 20 mya, respectively, the sea otter is a relative newcomer to marine life. In some respects though, the sea otter is more fully adapted to water than pinnipeds, which must haul out on land or ice to give birth. [24]
Mediterranean whales are essentially rorquals ("skinny" whales): during the most intense period of industrial whaling (late 19th and early 20th centuries), right whales (cold-water whales, for their blubber) were the main target, so this activity had less impact on the Mediterranean basin. [9]
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