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In beaked whales, the descent rate was consistently faster than ascent rate, at about 1.5 metres per second, regardless of dive depth, and at a steep angle of from 60 to 85 degrees, Fluke rate for Z cavirostris was higher at the start of the dive, but reduced by about 50 m depth, with a constant descent rate, consistent with buoyancy reduction ...
They showed mathematically that drag on undulatory swimmers (such as dolphins) can indeed be greater than the muscle power it generates to propel itself forward, without being paradoxical. They introduced the concept of "energy cascade" to show that during steady swimming all of the generated muscle power is dissipated in the wake of the ...
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]
Sound travels about 4.5 times faster in water than in air, [99] and at a similarly higher speed in body tissues, and therefore the interval between a sound reaching the left and right inner ears is much smaller than in air, and the brain is less able to discriminate the interval which is how direction of a sound source is identified. [101]
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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).