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At leisurely cruising speeds below 4.6 m/s, dolphins swim below the water's surface and only briefly expose their blowholes along with up to one third of their body at any one time. [11] This results in little splashing as they have a very streamlined shape. [ 13 ]
There are also aquatic spiders, although they tend to prefer other modes of locomotion under water than swimming proper. Examples are: Some breeds of dog swim recreationally. Umbra, a world record-holding dog, can swim 4 miles (6.4 km) in 73 minutes, placing her in the top 25% in human long-distance swimming competitions. [35]
[51] [52] River dolphins have non-fused neck vertebrae and can turn their heads up to 90°. [53] Dolphins swim by moving their fluke and rear body vertically, while their flippers are mainly used for steering. Some species porpoise out of the water, which allows them to travel faster. Their skeletal anatomy allows them to be fast swimmers.
Though not quite as flexible as seals, some dolphins can travel at 55.5 km/h (34.5 mph). Dolphins use their conical shaped teeth to capture fast-moving prey. They have well-developed hearing which is adapted for both air and water and is so well developed that some can survive even if they are blind.
Sea water is 827 times denser than air. Due to the higher density of sea water (1,030 kg m −3) than air (1.2 kg m −3), the force exerted by the same velocity on an organism is 827 times stronger in the ocean. When waves crash on the shore, the force exerted on littoral organisms can be equivalent to several tons.
Specific types of dolphins can be pink. [1] River dolphins are relatively small compared to other dolphins, having evolved to survive in warm, shallow water and strong river currents. They range in size from the 5-foot (1.5 m) long South Asian river dolphin to the 8-foot (2.4 m) and 220-pound (100 kg) Amazon river dolphin.
The study documents 36 instances of “aerial urination” by boto between 2014 and 2018 and records the sequence, duration and social context of the behaviour.
Wading and bottom-feeding animals (e.g. moose and manatee) need to be heavier than water in order to keep contact with the floor or to stay submerged, surface-living animals (e.g. otters) need the opposite, and free-swimming animals living in open waters (e.g. dolphins) need to be neutrally buoyant in order to be able to swim up and down the ...
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